have a few windows open! kelkoo as one, hotukdeals as another and finally quidco. For quidco you have to find a merchant, and link through from it to get the cashback. If you want to be really anal about it you could work out which deals work out better eg. �6 per dvd with 2% quidco and no voucher for one merchant, or �7 per dvd with 5% quidco and a 20% off voucher with another.