It's probably already been posted but thought I'd give a heads up anyway.
Proto pure bars (~31g pro, ~26g c) in holland and barrett are currently cheap as. Usually £2.85 each, they're in a sale buy one get one for 1p, but they're also scanning as half price so effectively £1.43 for two. Think it only applies to the chocolate ones, though, as I got a couple yesterday, and then today got a few more but went for 3 peanut butter and 1 choc and noticed that only the choc was at the cheaper price. Still averaged £1.20 each which isn't a disaster!