Anywhere I can buy chestnut flour, bread, or raw nuts in Boston area?

I've searched every instance of "chestnut flour" on this forum but couldn't find any information about where I could buy this. They didn't have any at Whole Foods, I . I want to try this bread for myself so I know directly what it's like, and I'd love to buy locally if I can, and have my money go to a permaculturist if possible. Thanks.