Just got back from my local Asda to find that Red Bull packs are on offer!
£2.50 for 4 or
£2.50 for 6
They also had a 12 pack which wasn't on offer for around £10.55 so your saving over 50% buying them seperatly in the 6 packs :D
Could post picture of recipt or shelf price tag if anyone wants confirmation :)