Watch eBay items and bid at the last second - Windows Shareware $14.99. BidSlayer is an auction assistant for eBay auctions. It allows you to watch an unlimited number of ebay items and bid on them in the last few seconds! BidSlayer automatically reads and displays all of the items that you are watching in MyEbay. BidSlayer has an server bidding option which can bid on items even when your PC is switched off.