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I would check Eagle Provisions on 5th Ave (near 18th St.) in Greenwood Heights (aka - Park Slope South if you're a broker). I've never looked for the elderflower syrup, but I used to buy my D'Arbo brand jams & preserves there back when I lived in the area. I wouldn't be surprised if the various Union Markets carried them as well (in Park Slope and Cobble Hill).
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