I canceled my Forza 2 preorder with Amazon and they still emailed me the code. And it wasn't some generic code either, it was in the standard 16 digit "redeem code" format from the Live Marketplace.
QVC.com has both the 360 and PS3 versions of Rock Band listed for $59.96 + $5.22 shipping. It doesn't say if it is the bundle or just the game, but as far as I am aware they are only selling the bundle at this point in time.