2 x 12 packs of Coke for £6 At Tesco. (Both online and in store)
(Coke / Diet coke / Coke Zero / Coke Caffeine Free)
Works out at 25p per can.
Did a quick search, and couldn't find this one posted. I realise that there are better deals in pretty much all the other supermarkets, but this is still a decent deal - and if you're doing your shopping in tesco anyway worth a punt.
Also these are the packs with cokezone points!
This is my first deal, so please be gentle!