0.1% quidco will swing it for many people, I'm sure!
Try this though.... via quidco you get 7% back from shop.com. They seem to be a shopping portal and guess what one of their links is. Yep - ebuyer. So, go into quidco, then shop.com and then ebuyer. Looks as though you'll then get 7% cash back.
I haven't tried this myself but Quidco have confirmed that they see no reason why this shouldn't work.