The BB nearest my work had RB3, but just vanilla GD, both tagged at $20. I'll probably do a ship-to-store order for GD+ unless I can stumble over one in the next day or two at a B&M.
The RB3 keyboard is just a 25-key USB MIDI keyboard, isn't it? If so, I've already got an E-Mu Xboard 25 I use that I suppose could plug into my Xbox, right?