Went into sainsburys and noticed 2 different packs of carlsberg export, one priced £6.50 and one for £7 so of course i went for the £6.50. But it went through the till for £3.25. I went back and got another pack also labeled £6.50 and it was also £3.25 even though it has a massive label saying £6.50!
This was instore at Merry Hill, dont know if the £7 one works. Hope this helps someone!