This post is for video game soundtracks in general. They're really expensive but people upload them all the time to Youtube. You can play the soundtrack on Youtube and record directly from your soundcard using Freecorder www.freecorder.com and it'll automatically convert to MP3.

I found this out b/c I really wanted the FFVII: Crisis Core soundtrack (it's amazing), but I spend too much money on import game CDs as it is.