Wait, wait, I think I've figured it out. Raise the price. Repeat until either the transaction is sufficiently profitable, or the customers go away.
That will work better for everyone than what Amazon has started to do lately, which is prevent you from buying certain items at any price until your order exceeds $25.
Basically, Amazon has started to tell their customers "No." That's new, and I agree with the other posters who call it a bearish sign.