A person growing mushrooms can make a little on the side or make a good living.
One 5 gallon bucket can produce about 10 pounds of oyster mushrooms per month. The grower can eat them or sell them for about $100.
2,000 sq feet of store space, with all the headaches of running a business, can produce about 3,500 pounds per month selling for over $8,000 per month.
To learn more, you can search online. For your convenience, you can start with the links below regarding growing oyster mushrooms.
Please note that I have no affiliation with either of these web sites.
I simply found them online and hope they will be helpful to you.
To learn more switch to page Mushrooms-101