Besides buying an expensive mushroom kit ($20-40), is there a simple and
cheap way to grow your own mushrooms? The results I found using google were
dismal. One website included instructions for growing mushrooms such as
this "Boil a bale of hay in a 55 gallon drum". Well as fun and safe as that
sounds, its a bit out of my gardening expertise. I do have access to used
coffee grounds, which I read could be used as a substrate for mushrooms (I'm
interested in growing button mushrooms).

Any advice is welcome