Easiest to get by me are Old Foghorn and Monster Ale, for American-made English-style Barleywine (is that sufficient, marquis?), Old Foghorn being my preference. Avery's Samael isn't too hard to come by, either, but it's fucking gross, so avoid it. I'll put Old Stock Ale up here, too. I know it's called an Old Ale, but let's cut the bullshit, it's a Barleywine. For English-made English-style Barleywine, JW Lees Harvest Ale, Fuller's Vintage Ale, and Old Tom are the easier to find, though JW Lees is definitely the creme de la creme.