And where can I buy it!
Bob's Red Mill. I'm definitely biased because it's a Portland area company, and when Bob recently retired he left the company to his employees which is pretty freakin' amazing. They make fantastic products all around. http://www.bobsredmill...
Bobs Red Mill is certainly a fine product but I would recommend Old School Mill, Albemarle, NC. Also available on-line.
Bob's Red Mill products are great, but I must confess that I patronize a old Southern company when I buy grits. I like the products from Nora Mill Granary, They are located in Georgia (near the Chattahoochee River). They are a family owned company, grind all of their own grains, and they do mail-order. Their prices are quite reasonable. http://www.noramill.com/index.html
Anson Mills (available online) coarse-ground grits are delicious.
The Old Mill stone ground grits in Pigeon Forge,Tennessee.