Guitar, Drums and Microphone ( Game sold seperately)
I have just been to my local GAME (Redhill,Surrey) and they had this price for the Rock Band: Band in a Box: Instrument Edition. My store only has the Xbox360 version so I don't know if it's the same price for the PS3 and Wii. I think it's nationwide.
I also checked the website - Same price but out of stock.