If you have played Awesomenauts, you are probably aware of it's wonderful soundtrack. The 80s-style synth menu songs, high energy battle tracks, and the stupidly varied character theme songs (BTW, they make for great ringtones). Easily my favorite indie game soundtrack, available for three dollars with a few bonus tracks.
A little warning though if you are buying the soundtrack on Steam. They not only include the songs in MP3 format, but in high quality FLAC as well. Great that they include FLAC, but the files are massive. The whole soundtrack is 2.1 GB in size, strange considering that the game is currently 1.7 GB. Despite that, it's still a good way to get the official soundtrack, being that they update it with new songs as they come out.
Now I wish Ronimo would implement a mode that replaces all the killing spree themes with Darude Sandstorm. It's just a thought.