I sell starters for food fermentation.  I  have sourdough starter for $5.00.   Milk kefir grains for $10.00.   Kombucha starts for $2.00.  Water kefir starts for $10.00.  User friendly yogurts; Matsoni and Viili for $5.00 each. 

I also sell  "Prills" for  $20.00  used to dechlorinate city water and raise the ph.

I also sell  "Mrs. Seal's" Strainer cloths for harvesting living lacto-bacillus bacteria from yogurt or kefir wheys.   $7.00