When selling items in a store(except value items such as rubies, and jewels etc.) hold down the R2 Button and mash the sell button for as long as you want. While holding R2 the item is not removed from your inventory, meaning you can sell the item as much as you want. After doing this you can go and buy that item back more than once. So, if you want to dual-wield your weapon, sell it then buy it back twice to make your attacks more powerful.
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