<<Disclaimer: Verify this information before applying it to your situation.>> Don, Last week-end I happened to go into a deli near my hourse in South San Francisco. While there I happened to notice a sign stating that they stocked the following special items and chestnut flour was one of the things listed. I bought a 500 gram bag for $9. Not cheap. It says on the label to use one part of the chestnut flour to 4 parts "regular" flour. It is a product of Italy and is distributed by Chestnut Hill Orchards, Inc, 3300 Bee Caves Road, Suite 650, Austin, Texas 78746. It states that you can send a SASE for free recipes and it is laveled as gluten free. I imagine that if I am able to find it in my little town, you should be able to find it in a deli in New York City. By the way, I haven't tried it yet, but I hope to soon make one of my favorite Christmas cookies using it. I keep it in the refrigerator because they kept it refrigerated at the deli. Ellen SSF,CA