Dupe Repairable items
If you have one of those items that can be repaired into another item you can get multiple copies of that item.
Get the repairable item and go to the Merchant. Select the repair option, and before you click okay for the price move the item out of your inventory (i.e. trade it off to another person or something like that). Now click repair and you will get the new item. Rinse/Repeat as you wish.