There are several efficient methods to grow mushrooms at home inexpensively.

Here are some methods:

1. Mushroom Grow Kits:
   One of the easiest and most efficient ways to grow mushrooms at home is to purchase a mushroom grow kit. These kits come with all the necessary materials and instructions to grow mushrooms in your home.
2. Straw or Hay Bales:
   Straw or hay bales are cheap and easy to find, and they make an excellent growing medium for mushrooms. All you need to do is wet the bales, add spawn (mushroom spores), and wait for the mushrooms to grow.
3. Coffee Grounds:
   Coffee grounds are another inexpensive growing medium for mushrooms. Simply mix the coffee grounds with mushroom spawn and place them in a container with a lid. Keep the container in a dark, cool place, and the mushrooms will start to grow.
4. Cardboard:
   Cardboard is an excellent growing medium for mushrooms because it is full of nutrients. To use cardboard, soak it in water until it is fully saturated, then add mushroom spawn and place it in a container.
5. Logs:
   If you have access to a wooded area, you can use logs to grow mushrooms. Simply drill holes in the logs and insert mushroom spawn. Keep the logs in a shady, humid location and wait for the mushrooms to grow.
6. Compost:
   Compost is an excellent growing medium for mushrooms, as it is full of nutrients. Simply mix mushroom spawn into your compost and keep it moist and in a dark place.

Remember that growing mushrooms requires some patience and care, so be sure to follow the instructions carefully and monitor the growing process regularly.