Gamestation have brought out a new gamers elite loyalty card giving 2.5% in points on not only purchases but also trade-ins. To apply, go to any store and sign up for free.
I should also add that there are achievements which earn you more points!
They also have a triple points offer until the 14th october.
Direct Link: http://www.gamestation.co.uk/lowdown.aspx?lid=21357&cm_sp=GSElite-_-Topnav-_-Join