Ok quidco is doing 25% cashback on all sales with CDkeys
So go through quidco first then go to cdkeys.
So £50 steam is £47.99
Like Cdkeys on facebook you get 5% off saving of £2.40
Making it £45.59
then your 25% cashback will mean you've technically only paid £34.19 for £50
Steam £20 for £14.02 after cashback / discount
Steam £10 for £7.12 after cashback / discount
Dishonored £21.36 after cashback / discount
Watchdogs 2 £25.64 after cashback / discount
I could do alot more but no doubt people will post up seperate deals
The reviews on quidcos cdkeys page feedback would surgest you can use the 5% off too.
Not bad considering chrimbo comming up and the sales will be on and well every year cdkeys runs out of vouchers :Dhttp://www.quidco.com/cd-keys/?st=cdkeys&tr=11395&fn=index&fr=top&si=58260bb2cce84&sv=4-MS