Add a buyback button

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It would be awesome if there was a button for buybacks. Say if I am giving a product away for free but want it to be inputed so it tracks inventory. I would add the product on the register and then hit "buyback" so the price changes to $0 but it counts the item as sold for inventory purposes. I know you can go ahead and add a discount per item and perhaps that discount can be 100%. But if you use this function often as I do at my bar, it would be nice to make it easier somehow.