[quote name='majinvegeta-88']Picked one up at the Rochester Hills, MI old navy. Rung up 49.99 but the cashier manually adjusted the price down to 19.99. Thanks OP great price for the game since it just recently came out.[/QUOTE]
Same story. The two girls working were both convinced that ALL Rock Band games were supposed to be $19.99, so the cashier was more than happy to override the price from $49.99 down to $19.99, I didn't even have to ask. All I did was ask her to check what price it was ringing up at. So, score, but only at that same Rochester Hills, MI location (On Rochester Road, just north of Hamlin).
So thanks OP for the tip, but I have a feeling that this is EXTREMELY YMMV.