I love stone-ground for savory dishes like shrimp, tasso and grits. I buy a bag
whenever I'm at Charleston or Asheville. There may be some here, but I know these sources.
I use Bob's Red Mill yellow coarse ground for polenta. Not really sure what the difference is between coarse and stone, but it works out well.
Just read a good hint in CI: Take 1 cup of your cold liquid and stir the grits into that...then pour that into the rest of the boiling water. This keeps the grits from clumping up and leaving dry clods.