Game finders would be cool. Tell them what you want, desired condition, and amount you will pay and they will find a game for you. For a fee of course. Not sure that would work with most people but would be good for those building up a collection and not have the time or connections to find games. Some guys also don't mind paying a little extra to not hassle with finding and/or moving a game. Although, I imagine it would be a major pia to deal with picky pinheads and moving games up stairs.