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any euro-style groceries (russian, polish, whatever) that usually have the dried fruits and nuts, a deli-counter, packaged crackers/cookies/candies, will have them. They are all over Rego Park (63rd Drive or 108th Street) in Queens, but easily found down on Brighton Ave, as well as any other ethnic enclave like that.
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The FDA banned them. I was able to get them here in Massachusetts at Christmas, when they came in through Canada, but the store I bought them from said the FDA caught on and closed that route, so there's no way to get them in the US at a store.

