It depends how far you want to go, whether you are willing to purchase a small tent or not.

You would probably be able to fruit a mushroom block created at home, for very low money on the very low tech version.

We might need to DM as well. I can provide kits of a variety of different things if you would like. Different substrates suitable for different species, etc.

My 3x3 tent I grow in: $100
-1 shelving unit: $150
- cheap lights: $20
- lightningspore esp32 sensor unit: $60
- lightningspore shelly pro control unit: $115
- humidifier: $60

Give or take $505 cost for my tent. Ive probably missed a few things. But the technology scales very cheaply, a much bigger tent wouldnt cost that much more.

But dont let me scare you with that, lets talk and we can find simpler setups if that is more up your alley.