People get over their skis sometimes and have a bad trip, which is often caused by taking too much(though that’s not the only way to have a bad trip). That said, there are other “magic mushrooms” that are not psilocybin than supposedly can be toxic. It’s not something that would get mixed up though. You know what you are getting.
As far as where I get them.. nice try police officer Carlton😉 JK. They are about as easy to get a weed. It’s likely anyone that buys weed outside of a dispensary will know where to get some. Supposedly the spores are legal to buy online though, just have to grow them yourself.