As title says buy the new Batman Arkham Asylum game for either PS3 or Xbox 360 and get a free dual controller charging station for the same console free (usually sell for £19.99 each).
For Xbox 360 version add items 900/4997 and 566/9051 to your basket.
For PS3 version add items 900/4980 and 566/8980 to your basket.
Can be reserved online and picked up in store and the offer still applies. If ordering for home delivery you will have to pay the delivery charge aswell.
Link goes to Xbox 360 version