Source for Gluten-Free Flour

Sorghum seems to be one of the cheaper GF flours - I found it for $2.99 for a 2 lb bag at my local Indian Store under the name "Jowar."

Hodgson Mills has now started selling buckwheat flour. It's very nice and finely ground, I can find it at my local Stop & Shop for $3.99 for a 2 lb. box.

http://www.hodgsonmill.com/roi/673/All-Natural-Flours--Corn-Meals/

By far the most expensive GF flours I've found are teff & quinoa. Quinoa flour has gone up to $7.99/lb at my local health food co-op. There is just no way I can afford that, so we've been using mainly buckwheat, sorghum, millet, and brown rice.