Quite simple really, get Forza 2 half price when brought with any other Xbox 360 game.
Forza 2 is selling for £29.99, so you'd get it for £15 - great if you were planning to buy another 360 game!
You can even use it for Halo 3 pre-orders and pre-owned titles!
Don't forget 6% quidco too!
Gamestation have now put Forza up to £34.99, so you get it for £17.49 when bought with any other game not £15.00