Best Buy has a pretty sweet deal on Xbox 360 Rock Band games. Buy Rock Band 2: Xbox 360, which is on sale for $19.99, and get 50% off Lego Rock Band which is $49.99. It takes off $25. Shipping is only $1.98 for both. Final price: $47 shipped
Just add both to your cart and you will see the discounted price.
Thanks, SwagGrabber!