Hi,
It's not nearly as hard as it used to be. I've used the jar technique successfully. Go to Erowid and read some tutorials there and also I understand that Mycotopia is just re-starting after being closed for a few years.
They are actually legal in most states. There are hundreds of companies selling them. I purchased from a company...I can't remember the name. But they called themselves a Mushroom research center and were located in north Florida.