Just back from Asda with this rather good deal. They've recently had them for £7 which I thought was already a good price. Now even cheaper at £5. This was Asda at Aberdeen Beach, but I don't think it would just be a local promotion. So get down there and fill yer boots! Car boots that is!
If Cider aint your thing, then they had 12 cans of Tennents for the same price, and a few others I can't remember.
If Pear Cider is more your thing, then I spotted this other stonking good deal right here: http://www.hotukdeals.com/item/602798/bulmers-pear-cider-1-pint-568ml-bot