Smyths the toy store has got back in stock Rockband instruments for £39.99.
This is not the cheapest they have been, but i imagine they are the cheapest you will currently find them!
Here's some details;
This is the X360 Band in a Box
Click here to view Band in a Box PS3/PS2
Includes Guitar, Drums and Microphone Requires Rockband game (sold seperately). All Rockband items can also be bought individually.
Available on PS3, PS2 and X360. Please note the price is based on separate selling prices. Check instore for full details and special offers. Rock Band Wii is no longer available.
Showing as in stock in ALL smyths stores for reservation.