Hybrid MMO/single-player space adventure Miner Wars is offering early access at 70% off, making it about $13. I've yet to see anything of the game myself, but the concept of a fully destructible environment shared with multiplayer players is certainly intriguing. If it can offer an Elite-like space trading experience with Red Faction-style space-action destruction then developers Keen Software House might onto something. Hell, it might be a game experience all its own, unlike anything that has gone before - the idea of blasting your way through the inside of giant asteroids is certainly unusual. Whether these guys are too keen, however, will depend on the state of the early build. I feel like developers take a big risk going into these things early. It's a good way to get the community bringing in money and feedback, but it also means you might earn an unfair rep on your earlier build.
Anyone had a look? (The obligatory trailer is just a click below the surface.)