[aaroninsf]

Fwiw, at least in the places I've lived in the US,

The informal supply chain for such things is usually well established, and easy to find (and triangulate) quality within.

These mushrooms grow readily and in many places naturally in abundance (though as with all mushrooms of course you wouldn't want to pick them without being certain of your own abilities).

Erowid.org is a great resource for self-education btw.