a couple options...
Napster might get the bonus tracks they certainly have the extra tracks off the umpteenth Bowie reissues. Download the entire album decide what you want and pay .99 per track if so desired. I'm quite digging the convience of Napster, wish iTunes would offer similiar service.
Another route to go is yourmusic.com, run by the BMG music club folks with much less fuss then the club. Basically cue up list of CDs and one is shipped every month for $5.99 For those worried about finding anything good, they have the Rough Trade CDs available. Cancel anytime....
But for those looking for the double disc re-issues it will cost members 11.98 with free shipping. That applies to boxsets as well. i.e. the Join the Dots set costs 23.96. Much better price than iTunes, etc and one gets the physical product.