I've never had to do this, so I don't know the best way to go about it. I sold some stuff recently, and made it clear in the terms of the auction that payment was due within 3 days. One guy has not paid up yet, even after a "friendly" reminder. I cannot get a hold of him at all. Do you file a non-paying bidder strike against him right away? Send a second chance offer to the next guy? Relist the item? What will cost me the least with eBay? What is the best way to go about it?