Game Music Bundle 6 is here and it offers the Dust: An Elysian Tale, Braid, and Rogue Legacy soundtracks, among others, for a low price.
For $1 you get the soundtracks for the three games listed above, plus soundtracks for Electronic Super Joy and Famaze. If you go up to $10 you get another 19 soundtracks from games like Guacamelee, Mighty Switch Force 2, The Stanley Parable, and Papo & Yo. You can see the full collection of available soundtracks and compilations by heading here.
The intention of the Game Music Bundles is a way to support video game musicians and expand their fanbases in an inexpensive way. Game Music Bundle 5 offered a similar collection with soundtracks for games like Fez and Gunpoint for the same price.
[Source: Game Music Bundle]