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diff --git a/src/shopitem.h b/src/shopitem.h
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+/*
+ *  The Mana Client
+ *  Copyright (C) 2004-2009  The Mana World Development Team
+ *  Copyright (C) 2009-2010  The Mana Developers
+ *
+ *  This file is part of The Mana Client.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SHOPITEM_H
+#define _SHOPITEM_H
+
+#include "item.h"
+
+#include <stack>
+
+/**
+ * Represents an item in a shop inventory. It can store quantity and inventory
+ * indices of duplicate entries in the shop as well.
+ */
+class ShopItem : public Item
+{
+    public:
+        /**
+         * Constructor. Creates a new ShopItem.
+         *
+         * @param inventoryIndex the inventory index of the item
+         * @param id the id of the item
+         * @param quantity number of available copies of the item
+         * @param price price of the item
+         */
+        ShopItem(int inventoryIndex, int id, int quantity, int price);
+
+        /**
+         * Constructor. Creates a new ShopItem. Inventory index will be set to
+         * -1 and quantity to 0.
+         *
+         * @param id the id of the item
+         * @param price price of the item
+         */
+        ShopItem(int id, int price);
+
+        /**
+         * Destructor.
+         */
+        ~ShopItem();
+
+        /**
+         * Add a duplicate. Id and price will be taken from this item.
+         *
+         * @param inventoryIndex the inventory index of the item
+         * @param quantity number of available copies of the item
+         */
+        void addDuplicate(int inventoryIndex, int quantity);
+
+        /**
+         * Add a duplicate. Id and price will be taken from this item.
+         * Needed for compatibility with ShopDuplicateItems (see) class
+         * documentation).
+         */
+        void addDuplicate();
+
+        /**
+         * Gets the quantity of the currently topmost duplicate.
+         *
+         * @return the quantity of the currently topmost duplicate
+         */
+        int getCurrentQuantity() const
+        {
+            return mDuplicates.empty() ? 0 : mDuplicates.top()->quantity;
+        }
+
+        /**
+         * Gets the inventory index of the currently topmost duplicate.
+         *
+         * @return the inventory index of the currently topmost duplicate
+         */
+        int getCurrentInvIndex() const
+        {
+            return mDuplicates.empty() ? mInvIndex :
+                   mDuplicates.top()->inventoryIndex;
+        }
+
+        /**
+         * Reduces the quantity of the topmost duplicate by the specified
+         * amount. Also reduces the total quantity of this DuplicateItem.
+         * Empty duplicates are automatically removed.
+         *
+         * If the amount is bigger than the quantity of the current topmost,
+         * only sell as much as possible. Returns the amount actually sold (do
+         * not ignore the return value!)
+         *
+         * @return the amount, that actually was sold.
+         */
+        int sellCurrentDuplicate(int quantity);
+
+        /**
+         * Gets the price of the item.
+         *
+         * @return the price of the item
+         */
+        int getPrice() const
+        { return mPrice; }
+
+        /**
+         * Gets the display name for the item in the shop list.
+         *
+         * @return the display name for the item in the shop list
+         */
+        const std::string &getDisplayName() const
+        { return mDisplayName; }
+
+    protected:
+        int mPrice;
+        std::string mDisplayName;
+
+        /**
+         * Struct to keep track of duplicates.
+         */
+        typedef struct
+        {
+            int inventoryIndex;
+            int quantity;
+        } DuplicateItem;
+        std::stack<DuplicateItem*> mDuplicates; /** <-- Stores duplicates */
+};
+
+#endif