Your best bet with mushrooms is not to grow them but to go out and pick the wild varieties.
I know it can be daunting, but with a good field guidebook and a sensible degree of caution you will be well blessed with the best mushrooms you will ever eat.
I only started out last year. I have dined on parasols, chanterelles, ceps (picked both in England and France), birch boletus, amythyst deceivers, shaggy ink caps and a giant puffball the size of the thing that England can't seem to stick in the back of the net at the moment.
Yes there is some dangerous stuff out there but there are also about 9 species that you can't really mistake for any of the mushrooms that are going to cause you problems.
The golden rule is, if you have even the slightest doubt then leave the fungi in question well alone. And the old adage to support that goes: There are old mushroom pickers and there are bold mushroom pickers. But there are no old bold mushroom pickers.
Seriously, give it a try. You'll wonder why you ever paid a small fortune for tasteless buttons from the supermarket.
Happy hunting,
Stork