I worked in broadcasting for many years, and we regularly bought "production music" collections from a number of suppliers like Capitol Records, FirstCom, etc. Do a Google search on "production music", and you'll find a ton of it out there. We've been using Shockwave for a few years now, and we're very happy with that. Also, you can find some cool stuff at:

http://www.adultindustrymusic.com

http://www.soundslikesex.com