Part of getting bang for your buck in playing games and/or collecting is knowing your stuff and staying ahead of the spending curve. I thought it might be fun for anyone to throw out some games that are cheap now but you think will at some point catch on in a later trend and become expensive, and maybe help each other snap up some good stuff before it blows up.
A couple of games I think will eventually get big:
The Red Star (PS2)-right now it's only about $10 or so, but if you talk to anyone who's played it, they'll say it's one of the best games on the system. It's a YouTube video away from being a hot commodity.
Code of Princess (3DS)-its ties and resemblance to Guardian Heroes will likely cause this game to get big in the future. Right now it's about $20
Strider (PS3)-the Japanese market got a physical disc release of this awesome game, and if you install it on your US PS3, it plays the US version. Same for the Chronicles of Mystara disc. Right now it can be had pretty easily for around $25.
If anyone enjoys this, I'll try and throw out more predictions later. I'd love to hear some others!