diff --git a/frontend-admin/src/screens/admin/SettingsScreen.tsx b/frontend-admin/src/screens/admin/SettingsScreen.tsx
index 0fb7af5d..112a8f31 100644
--- a/frontend-admin/src/screens/admin/SettingsScreen.tsx
+++ b/frontend-admin/src/screens/admin/SettingsScreen.tsx
@@ -1161,13 +1161,22 @@ function PromotionProductPicker({
         });
     };
 
-    const updateProductQuantity = (id: number, quantity: number) => {
-        onChange({
-            ...catConfig,
-            products: catConfig.products.map((pq) =>
-                pq.product_id === id ? { ...pq, quantity } : pq
-            ),
-        });
+    // Chaque produit peut être en promo sur plusieurs paliers de quantité en
+    // même temps (ex: 1g ET 3g) — on ajoute/retire l'entrée {product_id,
+    // quantity} correspondante plutôt que de remplacer une quantité unique.
+    const toggleProductQuantity = (id: number, quantity: number) => {
+        const exists = catConfig.products.some((pq) => pq.product_id === id && pq.quantity === quantity);
+        if (exists) {
+            onChange({
+                ...catConfig,
+                products: catConfig.products.filter((pq) => !(pq.product_id === id && pq.quantity === quantity)),
+            });
+        } else {
+            onChange({
+                ...catConfig,
+                products: [...catConfig.products, { product_id: id, quantity }],
+            });
+        }
     };
 
     return (
@@ -1227,8 +1236,9 @@ function PromotionProductPicker({
                 </View>
             )}
 
-            {/* Mode "Sélection" : chaque produit choisi a sa propre quantité,
-                via les paliers de prix réels du produit (pas de saisie libre) */}
+            {/* Mode "Sélection" : chaque produit choisi peut être en promo sur
+                plusieurs paliers de quantité à la fois, via les paliers de
+                prix réels du produit (pas de saisie libre) */}
             {!catConfig.all_products && (
                 <View style={{ gap: spacing.xs }}>
                     {catProducts.length === 0 ? (
@@ -1263,13 +1273,16 @@ function PromotionProductPicker({
 
                     {catConfig.products.length > 0 && (
                         <View style={{ gap: spacing.s, marginTop: spacing.xs }}>
-                            {catConfig.products.map((pq) => {
-                                const prod = catProducts.find((p) => p.id === pq.product_id);
+                            {Array.from(new Set(catConfig.products.map((pq) => pq.product_id))).map((productId) => {
+                                const prod = catProducts.find((p) => p.id === productId);
                                 const tiers = (prod?.prices ?? []).filter((pr) => pr.active_price !== false);
+                                const selectedQuantities = catConfig.products
+                                    .filter((pq) => pq.product_id === productId)
+                                    .map((pq) => pq.quantity);
                                 return (
-                                    <View key={pq.product_id} style={{ gap: 4 }}>
+                                    <View key={productId} style={{ gap: 4 }}>
                                         <Text style={{ fontSize: 12, color: colors.textMuted }} numberOfLines={1}>
-                                            {prod?.name ?? `Produit #${pq.product_id}`}
+                                            {prod?.name ?? `Produit #${productId}`}
                                         </Text>
                                         <View style={{ flexDirection: "row", flexWrap: "wrap", gap: 4 }}>
                                             {tiers.length === 0 ? (
@@ -1277,11 +1290,11 @@ function PromotionProductPicker({
                                                     Aucun palier de prix actif pour ce produit
                                                 </Text>
                                             ) : tiers.map((tier) => {
-                                                const isSel = pq.quantity === tier.quantity;
+                                                const isSel = selectedQuantities.includes(tier.quantity);
                                                 return (
                                                     <TouchableOpacity
                                                         key={tier.quantity}
-                                                        onPress={() => updateProductQuantity(pq.product_id, tier.quantity)}
+                                                        onPress={() => toggleProductQuantity(productId, tier.quantity)}
                                                         style={{
                                                             paddingHorizontal: spacing.s, paddingVertical: 3,
                                                             borderRadius: borderRadius.sm, borderWidth: 1.5,
diff --git a/frontend-prep/src/components/ProductCard.css b/frontend-prep/src/components/ProductCard.css
index 23b4ae1a..c27a5729 100644
--- a/frontend-prep/src/components/ProductCard.css
+++ b/frontend-prep/src/components/ProductCard.css
@@ -122,6 +122,13 @@
     text-align: center;
 }
 
+.product-price-strike {
+    color: var(--text-muted);
+    text-decoration: line-through;
+    font-size: 0.75em;
+    font-weight: 500;
+}
+
 .product-stock {
     color: var(--text-muted);
     font-size: clamp(0.85rem, 2.5vw, 1rem);
diff --git a/frontend-prep/src/components/ProductCard.tsx b/frontend-prep/src/components/ProductCard.tsx
index 09ed2843..7170cdd1 100644
--- a/frontend-prep/src/components/ProductCard.tsx
+++ b/frontend-prep/src/components/ProductCard.tsx
@@ -28,7 +28,13 @@ interface ProductCardProps {
     image: string;
     stock: number;
     category: string;
-    prices?: Array<{ quantity: number; price: number; active_price?: boolean }>;
+    prices?: Array<{
+        quantity: number;
+        price: number;
+        active_price?: boolean;
+        promo_price?: number | null;
+        promo_percent?: number;
+    }>;
     hasVideo?: boolean;
     videoUrl?: string;
     categoryColor?: string;
@@ -63,6 +69,11 @@ function ProductCard({
     const isOutOfStock = stock === 0;
     const isComingSoon = coming_soon === true;
     const normalizedCategory = (category || "autre").toLowerCase().trim();
+    const firstPromoPrice =
+        prices?.[0]?.promo_price != null &&
+        prices[0].promo_price < prices[0].price
+            ? prices[0].promo_price
+            : null;
 
     const handleDetailsClick = (e: React.MouseEvent) => {
         e.stopPropagation();
@@ -171,9 +182,20 @@ function ProductCard({
                 <div className="product-info">
                     <h3 className="product-name">{name}</h3>
                     <p className="product-price">
-                        {price > 0
-                            ? `${price.toFixed(2)} €`
-                            : "Prix non disponible"}
+                        {price > 0 ? (
+                            firstPromoPrice !== null ? (
+                                <>
+                                    <span className="product-price-strike">
+                                        {price.toFixed(2)} €
+                                    </span>{" "}
+                                    {firstPromoPrice.toFixed(2)} €
+                                </>
+                            ) : (
+                                `${price.toFixed(2)} €`
+                            )
+                        ) : (
+                            "Prix non disponible"
+                        )}
                     </p>
                 </div>
             </div>
@@ -224,9 +246,11 @@ function ProductCard({
                                         key={priceOption.quantity}
                                         value={priceOption.quantity}
                                     >
-                                        {priceOption.quantity}
-                                        {unit} - {priceOption.price.toFixed(2)}{" "}
-                                        €
+                                        {priceOption.promo_price != null &&
+                                        priceOption.promo_price <
+                                            priceOption.price
+                                            ? `${priceOption.quantity}${unit} - ${priceOption.promo_price.toFixed(2)} € (au lieu de ${priceOption.price.toFixed(2)} €, -${priceOption.promo_percent}%)`
+                                            : `${priceOption.quantity}${unit} - ${priceOption.price.toFixed(2)} €`}
                                     </option>
                                 ))}
                             </select>
diff --git a/mobile/src/components/ProductCard.tsx b/mobile/src/components/ProductCard.tsx
index 5e150d0a..e6c6050f 100644
--- a/mobile/src/components/ProductCard.tsx
+++ b/mobile/src/components/ProductCard.tsx
@@ -47,6 +47,8 @@ interface ProductCardProps {
             quantity: number;
             price: number;
             active_price?: boolean;
+            promo_price?: number | null;
+            promo_percent?: number;
         }>;
         media?: Array<{ url: string; type: string }>;
     };
@@ -67,6 +69,11 @@ export default function ProductCard({
     const activePrices =
         product.prices?.filter((p) => p.active_price !== false) ?? [];
     const firstPrice = activePrices[0]?.price ?? null;
+    const firstPromoPrice =
+        activePrices[0]?.promo_price != null &&
+        activePrices[0].promo_price < activePrices[0].price
+            ? activePrices[0].promo_price
+            : null;
 
     const imageMedia = product.media?.find((m) => m.type === "image");
     const videoMedia = product.media?.find((m) => m.type === "video");
@@ -198,11 +205,33 @@ export default function ProductCard({
                 >
                     {product.name}
                 </Text>
-                <Text style={[styles.price, { color: colors.success }]}>
-                    {firstPrice !== null
-                        ? `${firstPrice.toFixed(2)} €`
-                        : "Prix non disponible"}
-                </Text>
+                {firstPrice !== null ? (
+                    firstPromoPrice !== null ? (
+                        <View style={styles.priceRow}>
+                            <Text
+                                style={[
+                                    styles.priceStrike,
+                                    { color: colors.textMuted },
+                                ]}
+                            >
+                                {firstPrice.toFixed(2)} €
+                            </Text>
+                            <Text
+                                style={[styles.price, { color: colors.success }]}
+                            >
+                                {firstPromoPrice.toFixed(2)} €
+                            </Text>
+                        </View>
+                    ) : (
+                        <Text style={[styles.price, { color: colors.success }]}>
+                            {firstPrice.toFixed(2)} €
+                        </Text>
+                    )
+                ) : (
+                    <Text style={[styles.price, { color: colors.success }]}>
+                        Prix non disponible
+                    </Text>
+                )}
             </View>
 
             <View
@@ -317,14 +346,39 @@ export default function ProductCard({
                                             {p.quantity}
                                             {product.unit || "g"}
                                         </Text>
-                                        <Text
-                                            style={[
-                                                styles.pickerOptionPrice,
-                                                { color: catColor },
-                                            ]}
-                                        >
-                                            {p.price.toFixed(2)} €
-                                        </Text>
+                                        {p.promo_price != null &&
+                                        p.promo_price < p.price ? (
+                                            <View style={styles.pickerPriceRow}>
+                                                <Text
+                                                    style={[
+                                                        styles.priceStrike,
+                                                        { color: colors.textMuted },
+                                                    ]}
+                                                >
+                                                    {p.price.toFixed(2)} €
+                                                </Text>
+                                                <Text
+                                                    style={[
+                                                        styles.pickerOptionPrice,
+                                                        { color: catColor },
+                                                    ]}
+                                                >
+                                                    {p.promo_price.toFixed(2)} €
+                                                    {p.promo_percent
+                                                        ? ` (-${p.promo_percent}%)`
+                                                        : ""}
+                                                </Text>
+                                            </View>
+                                        ) : (
+                                            <Text
+                                                style={[
+                                                    styles.pickerOptionPrice,
+                                                    { color: catColor },
+                                                ]}
+                                            >
+                                                {p.price.toFixed(2)} €
+                                            </Text>
+                                        )}
                                     </View>
                                     <Ionicons
                                         name="add-circle"
@@ -515,6 +569,21 @@ const styles = StyleSheet.create({
         fontWeight: fontWeight.bold,
         textAlign: "center",
     },
+    priceRow: {
+        flexDirection: "row",
+        alignItems: "center",
+        justifyContent: "center",
+        gap: spacing.xs,
+    },
+    pickerPriceRow: {
+        flexDirection: "row",
+        alignItems: "center",
+        gap: spacing.xs,
+    },
+    priceStrike: {
+        fontSize: fontSize.md,
+        textDecorationLine: "line-through",
+    },
     quickAddSection: { padding: spacing.m, borderTopWidth: 1 },
     quickAddBtn: {
         width: "100%",