The Co-op are selling these are 5 for £1 starting 08/09/10 and offer the range of 6 flavours (Peace, Strawberry, Mango, Cherry, Vanilla and Raspberry and it should be a 3 week deal if I do remember correctly.
I hear they dont taste that great but I am sure I will try them out at some point as the offers in my section lol. Either way certainly worth the money imo.
Edit: Sorry put 6 for £1 instead of 5, my mistake.
Edit2: Thanks for additional flavour.