Use the following voucher code to get £3 off when you spend £30 or more at GAME.co.uk.

Voucher code: NW05GME6
Expires: Unknown

If you need to add a little something to your order to push it over the £30 mark, GAME sell DVD wraps for 99p: http://www.game.co.uk/CoolStuff/Miscellaneous/~r333112/Silver-Stars-DVD-Wrap

I've just used the above to pre-order the special edition of Mirror's Edge for the XBox 360 for just £36.99 incl. delivery.