In addition to the Street Fighter IV OST, Sumthing Digital also has Kota Suzuki’s Resident Evil 5 soundtrack up for sale .  Your 10 bucks will get you not one, not two, but THREE discs of creepy RE5 goodness, or you can buy the individual tracks for 99 cents each.

While most game soundtracks are pretty predictable stuff, Capcom has always gone the extra mile, from classics like Mega Man and Duck Tales up to RE5, SFIV , and Dark Void .  I love being able to hear this music outside of its game context–really makes you realize the talent and energy that goes into making these games such an involving experience. 

Of course the order page has a ton of samples as well, so feel free to try before you buy.