Sorry, I was confused. I source my substrate from Bonsai Jack (free shipping in the USA). I use their organic pre-mixed soil. And Sphagnum at any local nursery or Amazon (Free Prime Shipping). For the Akadama, also Amazon (Free Prime Shipping), which is not always in stock due to the terrible supply chain issues. Links below. Akadama is not mandatory and it's expensive, but I've been seeing excellent results with it the last 2 growing seasons.