diff --git a/src/server/game/Entities/Player/Player.cpp b/src/server/game/Entities/Player/Player.cpp
index a46e7806961..6830a7a0db0 100644
--- a/src/server/game/Entities/Player/Player.cpp
+++ b/src/server/game/Entities/Player/Player.cpp
@@ -20965,7 +20965,7 @@ inline bool Player::_StoreOrEquipNewItem(uint32 vendorslot, uint32 item, uint8 c
     ItemPosCountVec vDest;
     uint16 uiDest = 0;
     InventoryResult msg = bStore ?
-        CanStoreNewItem(bag, slot, vDest, item, pProto->BuyCount * count) :
+        CanStoreNewItem(bag, slot, vDest, item, count) :
         CanEquipNewItem(slot, uiDest, item, false);
     if (msg != EQUIP_ERR_OK)
     {
@@ -20981,7 +20981,7 @@ inline bool Player::_StoreOrEquipNewItem(uint32 vendorslot, uint32 item, uint8 c
         for (int i = 0; i < MAX_ITEM_EXT_COST_CURRENCIES; ++i)
         {
             if (iece->RequiredItem[i])
-                DestroyItemCount(iece->RequiredItem[i], iece->RequiredItem[i], true);
+                DestroyItemCount(iece->RequiredItem[i], iece->RequiredItemCount[i], true);
         }
 
         for (int i = 0; i < MAX_ITEM_EXT_COST_CURRENCIES; ++i)
@@ -20996,7 +20996,7 @@ inline bool Player::_StoreOrEquipNewItem(uint32 vendorslot, uint32 item, uint8 c
         EquipNewItem(uiDest, item, true);
     if (it)
     {
-        uint32 new_count = pVendor->UpdateVendorItemCurrentCount(crItem, pProto->BuyCount * count);
+        uint32 new_count = pVendor->UpdateVendorItemCurrentCount(crItem, count);
 
         WorldPacket data(SMSG_BUY_ITEM, (8+4+4+4));
         data << uint64(pVendor->GetGUID());
@@ -21004,7 +21004,7 @@ inline bool Player::_StoreOrEquipNewItem(uint32 vendorslot, uint32 item, uint8 c
         data << int32(crItem->maxcount > 0 ? new_count : 0xFFFFFFFF);
         data << uint32(count);
         GetSession()->SendPacket(&data);
-        SendNewItem(it, pProto->BuyCount * count, true, false, false);
+        SendNewItem(it, count, true, false, false);
 
         if (!bStore)
             AutoUnequipOffhandIfNeed();
@@ -21062,7 +21062,7 @@ bool Player::BuyCurrencyFromVendorSlot(uint64 vendorGuid, uint32 vendorSlot, uin
 
     VendorItem const* crItem = vItems->GetItem(vendorSlot);
     // store diff item (cheating)
-    if (!crItem || crItem->item != currency || crItem->Type != 2)
+    if (!crItem || crItem->item != currency || crItem->Type != ITEM_VENDOR_TYPE_CURRENCY)
     {
         SendBuyError(BUY_ERR_CANT_FIND_ITEM, creature, currency, 0);
         return false;
@@ -21100,7 +21100,7 @@ bool Player::BuyCurrencyFromVendorSlot(uint64 vendorGuid, uint32 vendorSlot, uin
 
             uint32 precision = (entry->Flags & CURRENCY_FLAG_HIGH_PRECISION) ? 100 : 1;
 
-            if (HasCurrency(iece->RequiredCurrency[i], (iece->RequiredCurrencyCount[i] * count) / precision))
+            if (!HasCurrency(iece->RequiredCurrency[i], (iece->RequiredCurrencyCount[i] * count) / precision))
             {
                 SendEquipError(EQUIP_ERR_VENDOR_MISSING_TURNINS, NULL, NULL); // Find correct error
                 return false;
@@ -21193,6 +21193,13 @@ bool Player::BuyItemFromVendorSlot(uint64 vendorguid, uint32 vendorslot, uint32
 
     if (crItem->ExtendedCost)
     {
+        // Can only buy full stacks for extended cost
+        if (pProto->BuyCount != count)
+        {
+            SendEquipError(EQUIP_ERR_CANT_BUY_QUANTITY, NULL, NULL);
+            return false;
+        }
+
         ItemExtendedCostEntry const* iece = sItemExtendedCostStore.LookupEntry(crItem->ExtendedCost);
         if (!iece)
         {
@@ -21223,9 +21230,9 @@ bool Player::BuyItemFromVendorSlot(uint64 vendorguid, uint32 vendorslot, uint32
 
             uint32 precision = (entry->Flags & CURRENCY_FLAG_HIGH_PRECISION) ? 100 : 1;
 
-            if (HasCurrency(iece->RequiredCurrency[i], (iece->RequiredCurrencyCount[i] * count) / precision))
+            if (!HasCurrency(iece->RequiredCurrency[i], (iece->RequiredCurrencyCount[i] * count) / precision))
             {
-                SendEquipError(EQUIP_ERR_VENDOR_MISSING_TURNINS, NULL, NULL); // error not verified for currencies
+                SendEquipError(EQUIP_ERR_VENDOR_MISSING_TURNINS, NULL, NULL);
                 return false;
             }
         }
@@ -21267,7 +21274,7 @@ bool Player::BuyItemFromVendorSlot(uint64 vendorguid, uint32 vendorslot, uint32
     }
     else if (IsEquipmentPos(bag, slot))
     {
-        if (pProto->BuyCount * count != 1)
+        if (count != 1)
         {
             SendEquipError(EQUIP_ERR_NOT_EQUIPPABLE, NULL, NULL);
             return false;