Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Sound › I’m making a short film and need music!!! › Go to http://www.twistedtr
Go to http://www.twistedtracks.com and they have a $50 free gift certificate for registering (or logging in if you’ve been there before) good for anything on their site!
You could also try AcidPlanet (www.acidplanet.com) – I believe there are folks there who are willing to let you use their stuff.
Also Kevin MacLeod (http://www.incompetech.com/m/c/royalty-free/) allows free use as long as you give him credit (Creative Commons License).