Same with tesco, took mine fishing and it was nice but needed a cushion.
Others have mentioned alternatives cheaper in b&m and other supermarkets. However it's not exactly comparing like for like as these are branded ones not the supermarkets own version.
£6.99 in Tesco, 2 for £12. Cold
Asda have similar chairs in store currently 2 for £14 if that helps anyone.
Probably big demand at the moment