Hands up, you got me, I'm a severe eBay addict. I get so many crazy bargains there it's untrue. That being said it's hit and miss and you need to have some patience to get the best deals. I like to use an Auction Sniping site to help me not get sucked into a bidding war against the faceless evil that is the Sith (anyone bidding against me!). The only other real tip I have is to really dig into the search options and learn how to use the filters etc.