This seems to be a good deal for EA Sports Active pre order.
Think Wii Fit but cheaper, possibly better, and compatible with the Wii balance board (if you have it already).
This is the best price I have seen for this after a quick look.
At play.com £29.99 + (possible 5% coupon) + Quidco
Amazon is the same price if you prefer them - though no Quidco etc.
Play.com - £29.99
Amazon.co.uk - £29.99
The Hut - £34.73
Zavvi.co.uk - £34.95
Game - £34.99
Game Station - £34.99