I used to use emusic before they screwed that up. Currently I believe all you can get are ones that let you stream to a pc for a monthly fee and if you want to put the track on a portable you have to buy each track or album.

Link

This is what I have been waiting for so I hope it really comes out soon. I would prefer someone like emusic that has more inde stuff did it this way but I will try it out with napster anyway.