I see. I think I can get by with using Akadama because I do live in a warm climate. I understand what you're saying about it being pricey, but I found a dealer on eBay https://www.ebay.com/itm/Akadama-Japanese-Bonsai-Soil-Red-Line-1-Gallon-Small-/170397983527?pt=Fertilizer_Soil_Amendments&hash=item27ac82e327 who sells it for reasonable prices. Plus they are located in San Francisco, CA. I'm in Escondido, CA so the shipping isn't bad.
The trees I'm most serious about are my JBPs, and I'd like to begin using what the pros use. I found a video https://www.youtube.com/user/chasnsx#p/u/16/eF3uxyb0x3o where a person shows what he uses for soil.