Last time I shopped for these (before the school hols) they were £1.09 for 6 cartons. This evening I was in Tesco and they were only 62p for 6 cartons - that's a little over 10p per carton. Excellent value, in my opinion.
I thought it was a misprice and bought loads, ready to take them to Customer Service after they had been rung through, but they scanned at 62p and, having checked, they are that price online as well.
Apple juice is still £1.09 for 6 cartons.
The 3-pack of orange juice is also 62p!!! - But who wants 3 when you can have 6?