I know this is really really late but i've only just found this post on Google. There is one place you can sell your beats, you can sell leases and exclusives. They don't take any commission and you can sell them on as many websites as you want, including MySpace and Facebook. You get some serious exposure, i'm raking in the sales with it. The website is
Sell Beats Online on Unlimited Websites - myFlashStore.net