Amazon has started listing all the Rock Band Accessories for both Xbox 360 and PS3.  As indicated by the E3 showing, this game will be huge come the holidays, so you may want to pre-order today if you want to secure a copy.  The Rock Band Collection comes in at $199 and includes the game, drums, microphone, and guitar ($230 sold seperately).

All are available with free shipping and if the price decreases, you are guaranteed the lowest price:

Amazon Pre-Order Price Guarantee! Order now and if the Amazon.com price decreases between your order time and release date, you'll receive the lowest price.

Check em out:

• Amazon - Rock Band Collection (PS3) ($199)
• Amazon - Rock Band Drums (PS3)
• Amazon - Rock Band Microphone (PS3)
• Amazon - Rock Band Wireless Guitar (PS3)
• Amazon - Rock Band Game (PS3) 

Xbox 360:

• Amazon - Rock Band Collection (Xbox 360) ($199)
• Amazon - Rock Band Drums (Xbox 360) 
• Amazon - Rock Band Microphone (Xbox 360) $29
• Amazon - Rock Band Wireless Guitar (Xbox 360) 
• Amazon - Rock Band Game (Xbox 360)