The dark web or travel to a state that is doing experimental treatments and has lax laws. Oregon and Denver have state/local laws decriminalizing them at least
edit: comment I replied to initially just said "the dark web" and the additional info was added after I replied.
It may be the case that when accidentally applied to a sterile growth medium, such as brown rice flour in a mason jar which was autoclaved in a regular pressure cooker for about 45 minutes, that after a few weeks the microscopy specimens will provide you with a new way to look at the world.
Be careful though, It's really easy to inadvertently drop the mason jars face down in a plastic tub that you use to store perlite that you bought from walmart, dislodging this nondescript white rubbery substance onto some tinfoil squares or better yet a metal rack suspended just above the perlite.
If you forget about the mistake you made with the mason jars and the plastic tub for a few more weeks, and the conditions remain humid enough somehow, you will sometimes find a complex biological reaction has occurred in the chamber.
Its important not to harvest them just before the veil is broken, chopping them up with a sharp knife and stirring them into a pot of water set to a low simmer for about 20-30 minutes.
In any case, if you discover that you, despite your best efforts, have still made this error, you should strain the chopped peices out and discard the water, or "tea", in a way that conforms to local and federal law. Some lemon juice and/or Numi brand morroccan mint tea helps with the disposal.
You might need some friends to help with that part though, it can take about 6-8 hours. You'll likely have a little trouble sleeping after all that work, so make sure to leave the next day open. I also recommend getting a bit stoned first using recreationaly legal marijuana.
Unfortunately, it sounds like way too much work for me.. and I'm too paranoid to risk going to jail for this hobby.. but I wish all those who do this the best. It's probably a lot safer and definitely cheaper than getting your mushrooms on the black market.
But, I'll certainly grant that the Drug War isn't well known for its ROI.
You can always take a nice vacation to Jamaica. https://www.mycomeditations.com/ (edit: website appears broken, currently. How unfortunate!)
This practice is totally legal in Jamaica, and mycomeditations specializes in group mediated psilocybin experiences and, rather importantly, includes integration discussions afterwards in a calm environment appropriate for self exploration.
For that, I highly recommend watching Alan Rockefeller's videos on psilocybin mushroom identification: [1] [2]