@fly mentioned mushroom grow kits, thinking I would give them the thumbs down because I grow mushrooms. nah, those things are fine, they are, as I will show, the same thing I do, I just make 12-16 of those kits at a time. Most kits on the market are 6-8 lbs. and will produce, optimally, 2-3 lbs of mushrooms. 4 if you're "pro grade"
Anyways . .
Start with purchased mushroom spawn - this is like a mushroom kit, but the food is almost entirely eaten up by the mushroom roots/ "mycelia". All the mycelia in the bag is like the BORG collective - part of the whole but can function independently. Genetically identical.
SPAWN - $28 for 6-7 lb.s, that gets made into 8, 8 lb. bags. *I bought two bags of spawn so I made 16 "kits". Planning for 45- 65 lbs of "King Oyster" shrooms. They can get, allegedly up to 3" diameter stems, 12" long. I've had some maybe 2"X8" - my space won't allow me to go bigger.
8 bags, each was filled with 1/2 gallon of wood stove pellets, 1/2 gallon of water, pressure cooked for 1 hour. Each bag then gets 2.5 cups of the spawn, sealed and set in a room temp location(dark) for 10-14 days.
Ok, 2 weeks later - ready to go. This is basically what they ship you in a mushroom kit. DEpending on type of 'shroom, you will either cut the top off or poke holes in the bag.
One week later . . . .
Left is on day 7, middle is day 5, right is day 3.