<<Disclaimer: Verify this information before applying it to your situation.>>
Most have said they get it at local Asian markets or international sections in big grocery stores at a range of 49 cents to $1.10 per pound. Some order in 5# increments from Energy foods and get it in 1# bags. Others have said Roben's catalog has it the cheapest so far.
Last time I bought in bulk I bought 25# from Bob's Mill for $75 ordered and shipped. It kept beautifully in my deep freeze. They did not have it for sale in that large of a quantity last I checked.
Will continue to summerize as answers come in. Thankyou all for sharing.
* Visit the Celiac Web Page at www.enabling.org/ia/celiac/index.html *