My wife Donji uses eBay all the time. Here's some tips from PC Magazine
Think of eBay as the ultimate return policy. No matter where or when you bought an item (or from which crazy relative you received it as a gift), you can turn around and sell it, sometimes for more than what you paid. The eBay marketplace is no longer a phenomenon; it's a hobby, a livelihood, and even a way of life for millions of addicts around the globe. But no matter how much you sell on eBay, odds are you're missing a few opportunities to maximize your bottom line. Here are some tips that can help.