This is my favorite ebay search when I'm not looking for anything in particular. It's just a search for the word "rare" for all of the categories in the video games section. Then I go to the closed items and sort it so the highest price items are frist. You can see some people who tried to get some insane prices for there stuff and some genuinely interesting items. Check it out. Maybe post your favorite search here, if you have one.

http://search-completed.ebay.com/sea...combine=y&st=2