Rock Band 1 kit + Rock Band 2 disc is 79.99 with free shipping here: https://www.rockband79.com/?c=mtvshopnl Apparently its worth $20 bucks for better equipment. I have this and was fine with it.

Lego Rock Band comes out tommorrow, Nov 3. Unique code (i.e. one time use it sounds) in the manual lets you export the songs to your PS3/360 for use with regular rock band games for an additional $9.99. Gonna try to rent it and see if I can update my song collection for under $20....