PHP Pro Bid is the most powerful auction software package 
  currently on the market. It's features alone surpass any other 
  Auction software. Ideally suited to Small-Medium Businesses 
  PHP Pro Bid enables you to start up your very own eBay style 
  web auction service. 
  Installation is simple and takes less than 10 minutes!. 
  You can control every aspect of the web-site via the 
  PHP Pro Bid Admin control panel.

PHP Pro Bid Software Package