Greenthumbskunk
PICK YOUR OWN
Ya I have my own land.there's an initial investment like with anything, mine was $300 for the 'take and bake' kit from buildasoil that made about 70gal of soil and had everything but worms. It was peat based and had lots of minerals and grains stuff in the initial amendments so it needs to set for a bit.
At the same time I bought a stackable worm bin (but you can make one from stuff you have) and got that going with 1000 worms from uncle jims.
I also put out cardboard and stuff outside and spent a few minutes each morning gathering local worms to add in. No clue what survived but they'rer still thriving.
After trying a few things I no longer top dress during the grow, except to add castings if I see any gnats. So my main expense now is Craft Blend, which is easier than sourcing all the ingredients and it's a good mix. I add a cup per 7g tote, some bat guano, insect frass and fish bone meal on top of what is already in the blend. I bought some sprouting barley cheap (buildasoil) and am growing my own now but still have a ton of the original sack. I'm malting it fresh now.
Hope that helps. If you have a yard or some land you can get into making all your own inputs.
Currently I prob have maybe 500 gal worth of coco I'm using so the expense would be a lot if I bought it all