Originally Posted by RedShoe

I basically hit all these.

RoyaltyFreeMusic.com
SoundClick
Productiontrax.com
Music Bakery
The Beat Suite
Partners In Rhyme
FreePlayMusic.com
Smartsound.com
Shockwave-Sound.com
StockMusic.net



My resources might be a touch out of date though, I need newer sites to hit up.