Any on line spore dealer located in the United States should be reliable to ship the product. Unlike cannabis seeds, spores (even psilocybin) are completely legal to sell and posses. As far as growing them, its fairly simple as long as you follow the directions 100 percent, at least until you figure out what is happening. Google "PF TEK" for a good beginners method. Like I said, as long as you follow the directions to the tee, you'll be fine, just don't try and cut corners or improvise. The shroomery is a good place to start.

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