Cheapest I've found for the standard edition Fable 2 on the Xbox 360.
To get this price, use the 5% off code at the checkout (discount code = perks).
Alternatively if you are a more than customer you can get 10% off bringing the price down to just £31.44. Bargain!
Alternatively use Quidco for 5% cashback, although according to quidco T&C's cashback will be declined if discount codes are used, but could be worth a try......what's the worse that could happen?