"anything"?  I love gaming, but I can't think of a single game I would do anything to obtain.  If there is a game I really want, I just wait. 

hmmmm.... I agree with Jgusw.  However, if we are talking about imaginary games that don't exist or will never exist, my answer would be quite different. 

A new Megaman Legends game, lol. Loved the first two gameplay and story wise.

I'm with jgusw, but to make things more interesting, let's say what game would I be willing to plop down $100 on for just the disc/cartridge ... and I'm drawing a blank there too. 

Sorry, I love gaming, but at the end of the day I'm a fairly casual hobbyist that just happens to like video games and the people who play them enough to be on this site. I'm not exactly a collector, though leeradical42 makes some good points for why I may want to become one. 

Steel Battalion for the original Xbox, including the beastly controller that comes with it. I've yet to find one locally for that's the only way I'll buy it to ensure the controller actually works and is the green button model, not the blue.

What? Stop looking at me like that?!?!

I had a chance to get that controller when it was cheap in a retro game store way back. I passed because seeing that thing in the real world makes you realize how huge it is. Too huge.

Gold Zelda cartridge.

Metroid Prime Trilogy; although, that's not to hard to get. How about Skies of Arcadia Legends for GameCube; however, that's not too difficult to get either. Panzer Dragoon Saga, now that's a tricky one - several hundred dollars for the original Saturn disc and no port available anywhere. I'll go with that.

Hmm, that's tough. Most of the games I've always wanted are readily available digitally (mostly Treasure's back catalog, even Radiant Silvergun), though I'd much prefer the physical releases. I think I'd have to go with KnightDriver and say Panzer Dragoon Saga because there is still no good way to play it other than the Saturn.

If we're talking games that don't exist, I'd want a new Chrono game.

I agree with Panzer Dragoon Saga.  I just want to experience it and basically every other Saturn game I missed.

I wouldnt do anything for a game but I would like to get my hands on a ps black label Ogre Battle: March of the Black Queen or a mint ps Thousand Arms physical disc that is.

A PS4 version of Monster Hunter with all the past monsters and locations and with cross play with the Vita. 

I wouldn't do anything for a game but pay the MSRP.