Best site to purchase band-recorded bass backing tracks of real songs?

[Strat-Mangler]

I've bought some of Moondance, Jet, and Band On The Run, but am wondering if there are any other places where I can buy backing tracks for bass of real songs recorded by professional musicians?

I like rock, especially classic rock.

Thanks a bunch in advance!
PS : Had no idea where to post this, so take it easy on me.

[MakiSupaStar]

There are a few bands, acts, and producers that will not necessarily sell just bass tracks, but the whole song broken down by tracks for remixing. I know Beck has done it, Crystal Method has also done it. Producers like Mad Professor also provide a ton of tracks with basslines. Not sure about rock, but I'm sure there are probably a bunch out there.