Area specific I know but this is a fantastic deal. It works out at less that £1 per chicken breast and they are much bigger than the chicken you get from supermarkets. They don't leak water when cooked and are also Halal.
Perfect for freezing.
Generally chicken from butchers tends to be about £30 per 5kg.
They do deliver locally as well if you spend over £30, details of where they deliver are on their website.