This trick only works with more than one character in your party. Go to a shop and choose an item to sell. Click on it as if you were going to sell it, then change characters to someone else in your party while you still have the item ready to sell. Click on the character inventory to give them the item. After that, click the item again and sell it to the shopkeeper. Stop talking to the shopkeeper and check your inventory. The person that originally owned the item still has it, and if you check the shop you sold the item to, they will also have it. Note: Do not return to the character's inventory that originally held the item while still in the shop; this will crash the game.