Different growing media can also be used, depending on the space that you have available and the variety of mushroom you select. Since I live in a one-bedroom in the city (which unfortunately lacks outdoor space), I don't have a ton of room to grow things (I do have a pretty nice little setup though). There are a ton of kits and things online that would allow for growing some delicious 'shroomies via (please note: I am totally not promoting any of the companies who's websites are linked below, it's just to show what I'm talking about):
1. Sawdust, corn, or woodchip filled bags
2. Sawdust, corn, or woodship filled boxes
3. Old logs (you can either get pre-inoculated (as shown here) or if you have the time (several months!) and space (lots of space!) and access to cherry or oak logs (I don't, unfortunately) you can inoculate your own logs with spores)
4. Various other media, including (as also shown here) a roll of toilet paper
Thanks so much to giardinaggioindoor for translating this to Italian!