You can list eBay auctions showing item price and shipping cost, and you can order the results by their sum, ascending order. This way you will filter out the scammers.

In case you push the "I accept" button once too much, you can always not pay and immediately write a negative comment on the scammer exposing his dubious commercial practices. You can actually make a new username for this activity. The scanner will have to make a new username as well.