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They come up on ebay fairly regularly in that size. Ask for measurements as B-15's always fit a size larger so a 40 might do the job. I had a Roughwear B-15A in size 38 that fitted like a 42.
I'm pushing a 44 these days, so that's why I was looking for a 42. I do see them regularly on the bay, but I thought I'd try the boards and see if anyone here had one for sale.