I got a voucher from Movietyme saying i have £1.00 off anything.
They're advertising GTA IV for £31.99, so with the £1.00 off voucher it is: £30.99
choose free delivery £0.00
and there you go, £30.99
I dont understand how quidco works so it may be even less.
My voucher code was:
You might need your own (if you got one from Movietyme)