Used to use ebay for all my gaming needs, but I don't do Paypal so that area has dried up a bit for me, I'd mainly hit there for the occasional NES game, or import PSX/Saturn games.

Right now I'm working on the Nintendo side of my collection, Play n Trade recently opened where I live, so I make a wishlist of games there, so whenever an NES or Gameboy game appears that I want, they give me a ring to come get it. That place also a few days ago provided me with a top loader NES, so far I'm pretty pleased with what they get, but sometimes I swear I see a game I want that I say I'll pick up next trip, but by next trip, said game is gone. Flipull Gameboy was the latest game I passed up, likely won't be there next time I go unless I'm lucky.