Guitar Hero II for the Xbox 360 is quite possibly the hardest game to get hold of in the UK at the moment. I spend over a week looking last week without success.
Over at Amazon.de they have them instock and when you add on tax and delivery it comes to a brilliant £59.29. The price on Amazon.co.uk is £67.98 with super saver delivery, but they are stating availability of 4-6 weeks..
Hope this helps someone out!