ClickSnap currently have a £5 cash back offer on Amstel 10x440ml. It's currently £8.40 at Asda, making it £3.40 after cash back. 34p per bottle.
Also works with Checkoutsmart which have the same offer, you just need to put the products on separate reciepts.
Offer is also on Strongbow Dark Fruits. £5 cashback on both clicksnap and Checkoutsmart. This is currently £10.60 at Asda making it £5.60 after cashback. Or £10 at Morrisons making it £5 after cashback, or 2 packs for £16, each pack £5.50 after cashback.