If you are using this for buyer/select shop, the number that goes here is the original purchase price of the item from buyer shop. For example, if you bought the item for 1000 coins, put 1000 here. If you are using this for smile market, the number that goes here is the amount you want in your gift box. You can put "0" in the "Desired Profit (coins):" section.

Buyer/Select Shop Example; if the item was initially bought at 1000 coins during buyer shop and you want to earn that 1000 back PLUS an extra 100 coins as profit when you sell during select shop, enter 100 here!