Found this in Game Station yesterday in Woking, Surrey.
"Chris Tarrant's 'Who Wants To Be A Millionaire?' game show has become one of the most watched TV shows. Thousands upon thousands of eager hopefuls have phoned in, trying to get their chance to win a million pounds. Those who haven't succeeded as yet can now live in their own illusory world and win a virtual million in this new PS2 version of the game, complete with optional Buzz! buzzer facility for up to four players."
This is one of their weekley deals and is £10 cheaper for 1 week only!! You can order this online - don't think you'll get it in time for Xmas, but this offer is on in their stores as well.
You can also get this PS2 game with 4 buzzers for £24.99 - Cheapest deal I have found.