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>google tells me £3.50 a bottle here but out of stock.
OK, if my web skills are decent, that's about $5.11 in American dollars. So I would imagine a case is rather pricey (would be surprised if you could get a six-pack).
I am one of those dumb Americans who will keep a Guinness as cold as possible, but Barney Flats is one of the few stouts that I still like even when it gets a bit "non-cold"