Coca Cola 12x330ml are currently on 2 for £7 but instore they have packs with 50% extra free, so 18 cans at 2 for £7
That's 36 cans for £7! - 19.4p a can
Includes regular & diet
didn't see 50% extra free on zero or caffeine free
Note; if ordering online you're not guaranteed to get the 50% extra free packs as they still had the normal 12packs instore as well.