Grow them yourself or learn to ID them and go hunting. I haven't bought shrooms in over a decade and I take them once every year or 18 months. I picked what ended up being 4 dry ounces in one day some years back. I was giving away to anyone who asked. Psilocybin-containing mushrooms grow basically anywhere where there (pick two) cows, people, grass, pine trees, cultivated lawns, hardwood mulch, rhododendrons, azaleas and college/municipal grounds with tropical to temperate climates.
You need to be extremely careful and ideally have a knowledgeable person help you until you really figure it out because there are mushrooms that will at best ruin your liver that look very similar to the ones you want in most of the places where the good ones grow. All Europe and the west coast Psilocybe cyanescens grows gregariously in big patches, sometimes intermixed with Galerina marginata, which will fuck you up in a death kind of way, not a fly to space kind of way. They look very similar, but are readily identifiable in the field. If you're in the US south and anywhere near cows, you're in luck - Psilocybe cubensis readily grows in cow patties and it's damn near impossible to get a wrong ID given the circumstances.
What's your city like? Where I am there's stickers and signs everywhere for weed deliveries. They usually have shrooms too. I'm in Canada so it's pretty casual here.
those are some rather large specimens- look at the container for size comparison. that’s easily $100 by way of a friendly deal from a pal who cultivates
Well if you learn to isolate on agar then grow it's the last $100 you'll ever spend. Spores in those are still good. After that it's pennies on the ounce.