Sell 5 random surprise books for $15 (ex shipping). Include a box to send back any books they don't want (or any other book). Process returned books (take pictu

Sell 5 random surprise books for $15 (ex shipping). Include a box to send back any books they don't want (or any other book). Process returned books (take pictures, put barcode, register title+author). For the next order give $3 discount for every book they sent back previously.