This is the best deal I've seen yet:

http://www.emusic.com/promo/viewersc...r2?fref=200000

125 FREE DOWNLOADS FROM eMusic.
NO RESTRICTIONS. iPod® COMPATIBLE.
If you like music, you’ll love the sound of this. Right now, you can enjoy 125 free music downloads from eMusic – all thanks to DIRECTV. Choose from over 900,000 songs compatible with every MP3 player.

I've used up about half of my free allowance, and while there's not a huge selection I was able to find a buch of electronica I'd been wanting. Cancellation was a snap.