@edgarblythe,
Those are only available in specialist shops over here, about 3-4 times more expensive than standard chocolate bars.
There's a shop in West Quay shopping centre that specialises in American sweets and pop. My youngest is really into his pops, he always wants to try something different.
A standard can of pop (330mils) in there costs £2.50, because they don't sell it anywhere else.
We have a sugar tax over here so standard coke is more expensive, but 8 cans of coke would cost £4.00 which works out at 50p a can. The imported stuff is 5X more expensive.
The difference in diet coke is even more pronounced, it works out at 40p a can, that makes the imported stuff 6X the price.