Short Mountain Cultures
Woodbury, TN
Fermented foods and organic grocery store. (They also offer fermentation workshops.)
Their water kefirs are absolutely to die for!
A couple of starter cultures and several books are available through the site.
If you are near the region, definitely stop by! Many local retailers in neighboring counties are stocking and selling their products as well nowadays, so you might keep an eye out for those if you live in Middle TN.
“If we are honest, we can still love what we are, we can find all the good there is to find, and we may find ways to enhance that good, and to find a new kind of living world which is appropriate for our time.” ― Christopher Alexander