Just ordered this myself so I thought I share my find.
Band Hero Bundle for the xbox 360 for 84.67 Pounds/ 93.87 Euro delivered at Amazon.de
(Cheapest one in the UK is 114.85 Pounds at shopto)
Also available for PS3 and Wii for 10 Euro more.
Includes: Band Hero game, guitar (new model), drums (new model) and mic.
EDIT (28.12.09) :
Price has gone up to 99.99 Euro plus delivery,
total inc delivery is now 93.56 GBP
Still over 20 pounds cheaper than the cheapest one in the UK :-)