http://www.gamemusicbundle.com/

a new game music bundle is up.

For $1 you can get the soundtracks of:

Horn
Squids 2
Puzzle Juice
Globulous
Organ Trail

For $10 you also get:

Aliens Incursion
Wyv and Keep
Flight of Angels
Mecho Wars HD
Polymer
iBlast Moki 2

More OSTs to unlock with more sales. I'm unfamiliar with most of these games so I don't know if the music is any good.

You can always check a sample.

I already bought it, as I did with two previous GMB (I didn't buy the first one, and I regret it).

Seems they have added some music from the game "Super Hexagon" today.

iPass...

iPass Second iEdition

Today they added (for $10+) the soundtrack for "Super Stickman Golf" and the album "Contingency" by Big Giant Circles.
The latter requires a twitter account and has already been part of the first game music bundle.