Beatles RB doesn't export to other Rock Band games, it is its own platform. There is no code at all nor is there any way to put the Beatles songs onto another game.
Yeah, all Rock Band equipment is confirmed to work in RB3. You'll only be missing out on the new "Pro mode" which will require cymbals for your set and the new stringed guitar. You'll be completely set if you purchase the Beatles bundle (sans the keyboard of course)
They got me with the auto-renewal =(
Last time I signed up for the trial I forgot to turn the auto-renewal off and even ordered some things via prime on the now paid membership. Thankfully (and praise Amazon!) when I went to cancel my membership online the system said that even though I had...
I can confirm that Stillwater, Oklahoma's store had a few rock bands for 50% off. Thanks TC, got me a lovely new Lego Rock Band game, been eyeing it for a while