Asda have a 'multisave offer' on most Coke Bottles, but I find this is a great size cos its enough for about 4 people and due to ithe bottle not being too big, there's no risk of it going flat in record time..
Found these in my local Slough store, though they were not stocked with the drinks- infact they were right at the end near the freezer section (?) Available online too.
Anyway, Sainsbury's often have this offer but haven't had it for a while, so methinks it's time to stock up from Asda seeing that my last supply has run out...
Single bottle price £1.19 (not hot) or 2 for £1.50 (yes please!)