Costco has dr earth right now. It's only a 222 but I use a bit for microbes and mycorrhizae. I usually mix it with garden tone and top with osomocote plus for pots. I think it's 25 dollars for 27 lbs.Love that Dr Earth's lol but it can be a bit expensive. Looking very well organized propagation Center. Thank you so much for posting let us know how it goes please