Was in my local wilkinsons (Sunderland town centre) and they had packs of Red Bull for 75p. I had to double take but I got 4 packs for £3. Been confirmed by others around the country so it must be a national deal.
Edit: And I mean there was 4 in a pack and that I got 16 cans for £3 (just to clear things up). Title updated to clear confusion.