I haven't looked for any commercial microbial products yet, but was thinking, that they would be on the expensive side, because I'm sure they are cultured in a sterilized lab environment, flow hoods, autoclaves, and microscopes aren't cheap, not to mention the biologists salary. But I'm glad you found an affordable product. The cost of organic
nutrients is the number one factor, why I am planning to start brewing my own compost tea. Happy growing !!!! P.S. I noticed that some of the links in your post are broken, I really was really interesting in reading the on*the parameters for using compost tea, and
nutrient management. I keep getting a 101 error when I click the link.