Double Fine has uploaded six game soundtracks to their Bandcamp page. They're all available for purchase, and you can stream them too.
Middle Manager of Justice soundtrack is $2.99 , Psychonauts: Original Cinematic Score is $7.99, Psychonauts: Original Soundtrack is $7.99, The Cave: Original Soundtrack is $7.99, Brutal Legend Original Soundtrack is $9.99, and the Dropchord soundtrack is $9.99.
via destructoid http://www.destructoid.com/psychonauts-brutal-legend-soundtracks-now-on-bandcamp-259132.phtml