diff --git a/src/Controllers/Common/ContentController.cs b/src/Controllers/Common/ContentController.cs
index 932ddf8..3a8abbf 100644
--- a/src/Controllers/Common/ContentController.cs
+++ b/src/Controllers/Common/ContentController.cs
@@ -754,8 +754,8 @@ public class ContentController : Controller {
             int itemId = request.Items[i];
             ItemData item = itemService.GetItem(itemId);
             UserGameCurrency currency = achievementService.GetUserCurrency(viking);
-            int coinCost = (int)Math.Round(0.8 * item.Cost); // 20% discount for members
-            int gemCost = (int)Math.Round(0.8 * item.CashCost);
+            int coinCost = (int)Math.Round(item.FinalDiscoutModifier * item.Cost);
+            int gemCost = (int)Math.Round(item.FinalDiscoutModifier * item.CashCost);
             if (currency.GameCurrency - coinCost < 0 && currency.CashCurrency - gemCost < 0) {
                 success = false;
                 break;
@@ -819,8 +819,8 @@ public class ContentController : Controller {
         for (int i = 0; i < itemIdArr.Length; i++) {
             ItemData item = itemService.GetItem(itemIdArr[i]);
             UserGameCurrency currency = achievementService.GetUserCurrency(viking);
-            int coinCost = (int)Math.Round(0.8 * item.Cost); // 20% discount for members
-            int gemCost = (int)Math.Round(0.8 * item.CashCost);
+            int coinCost = (int)Math.Round(item.FinalDiscoutModifier * item.Cost);
+            int gemCost = (int)Math.Round(item.FinalDiscoutModifier * item.CashCost);
             if (currency.GameCurrency - coinCost < 0 && currency.CashCurrency - gemCost < 0) {
                 success = false;
                 break;
diff --git a/src/Schema/ItemData.cs b/src/Schema/ItemData.cs
index bd95933..fc18947 100644
--- a/src/Schema/ItemData.cs
+++ b/src/Schema/ItemData.cs
@@ -97,4 +97,17 @@ public class ItemData
 
 	[XmlElement(ElementName = "p", IsNullable = true)]
 	public int? Points;
+
+	[XmlIgnore]
+	public float NormalDiscoutModifier;
+
+	[XmlIgnore]
+	public float MemberDiscountModifier;
+
+	[XmlIgnore]
+	public float FinalDiscoutModifier {
+		get {
+			return Math.Min(1f, (1f - NormalDiscoutModifier) * (1f - MemberDiscountModifier));
+        }
+	}
 }
diff --git a/src/Services/StoreService.cs b/src/Services/StoreService.cs
index b20a7ce..8994043 100644
--- a/src/Services/StoreService.cs
+++ b/src/Services/StoreService.cs
@@ -17,8 +17,11 @@ public class StoreService {
                 SalesAtStore = s.SalesAtStore,
                 PopularItems = s.PopularItems
             };
-            for (int i=0; i<s.ItemId.Length; ++i) {
+            IEnumerable<ItemsInStoreDataSale>? memberSales = s.SalesAtStore?.Where(x => x.ForMembers == true);
+            IEnumerable<ItemsInStoreDataSale>? normalSales = s.SalesAtStore?.Where(x => x.ForMembers == false || x.ForMembers == null);
+            for (int i = 0; i < s.ItemId.Length; ++i) {
                 newStore.Items[i] = itemService.GetItem(s.ItemId[i]);
+                UpdateItemSaleModifier(newStore.Items[i], memberSales, normalSales);
             }
             stores.Add(s.Id, newStore);
         }
@@ -27,4 +30,39 @@ public class StoreService {
     public ItemsInStoreData GetStore(int id) {
         return stores[id];
     }
+
+    private bool IsSaleOutdated(ItemsInStoreDataSale sale) {
+        if (sale.EndDate == null)
+            return false;
+        return sale.EndDate < DateTime.Now;
+    }
+
+    private void UpdateItemSaleModifier(ItemData item, IEnumerable<ItemsInStoreDataSale>? memberSales, IEnumerable<ItemsInStoreDataSale>? normalSales) {
+        if (memberSales != null) {
+            foreach (var memberSale in memberSales) {
+                if (IsSaleOutdated(memberSale)) continue;
+                if (item.Category != null && memberSale.CategoryIDs != null && item.Category.Any(x => memberSale.CategoryIDs.Contains(x.CategoryId))) {
+                    item.MemberDiscountModifier = memberSale.Modifier;
+                    break;
+                }
+                if (memberSale.ItemIDs != null && memberSale.ItemIDs.Contains(item.ItemID)) {
+                    item.MemberDiscountModifier = memberSale.Modifier;
+                    break;
+                }
+            }
+        }
+        if (normalSales != null) {
+            foreach (var normalSale in normalSales) {
+                if (IsSaleOutdated(normalSale)) continue;
+                if (item.Category != null && normalSale.CategoryIDs != null && item.Category.Any(x => normalSale.CategoryIDs.Contains(x.CategoryId))) {
+                    item.NormalDiscoutModifier = normalSale.Modifier;
+                    break;
+                }
+                if (normalSale.ItemIDs != null && normalSale.ItemIDs.Contains(item.ItemID)) {
+                    item.NormalDiscoutModifier = normalSale.Modifier;
+                    break;
+                }
+            }
+        }
+    }
 }