So there is this new thing that just started up where 4 indie games are bundled together and you could get them all for one low price. The 4 games are A.R.E.S. Extinction Agenda, Gemini Rue, Sanctum, and Nimbus. It started at about 2 1/2 bucks and every time someone purchases the bundle the price goes up slightly. If someone pays more than the current price, it knocks the cost down for everyone afterward. Weird, I know. Anyway I just got the bundle for $2.91, which is more than worth it for Gemini Rue alone. Right now it's at $2.98. Weird promotion but I couldn't say no to 4 games for under 3 bucks, especially since Gemini Rue was one of the games and I loved the demo. You can download the games directly or redeem them on Steam or Desura. All 4 of the games are Windows only as of right now but i know that at least Gemini Rue works fine through wine.
http://www.indieroyale.com/