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Should be in lots of different places under the name "sour salt". I believe I've seen this at Christina's in Inman Square, as well as the Armenian markets in Watertown (Sevan, Massi's, and Arax), and the Super 88 in Malden. I would call first, before going, to make sure they have it, but you'll want to ask for sour salt. The Butcherie in Brookline should have it as well.
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