In Massachusetts, try "Bread and Circus" stores for exotic flours.
I think that is where my wife found them. There is a store in
Wellesley and if you call them, I am sure they would provide you
with locations of other branches.
Also, buy your yeast there. They sell it in bulk. It is much cheaper
and MUCH better than the Fleishmans stuff you buy in the packets. With
the Bread and Circus yeast, we generally cut the yeast to half what the
recipe calls for - otherwise the bread tends to rise too much.