These transactions are not totally based on blind faith. The sites collect feedback on registered members after each auction, so you can learn about the experiences of others. You can find almost anything available here. They charge a small fee to the seller. Their listings are displayed on hundreds of sites around the web.
Most listings are free.
Haggle has thousands of items available. Basic listings are free. Yahoo Auctions has quickly become a serious player in the industry. Listing are fee. All rights reserved.