Hey Bobster
soundclick does it for 75 cents per download ... you keep 64 cents of every download.

Now how well it works I dunno, I got 45,000 youtube plays on lightning road song and tens of thousands of downloads .. but alas all free. I may have had none had I charged.

You can give both a try, costs nothing to sign up. Two songs I am charging for to generate some bucks for the autism foundation, so far 20 dollars LOL