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Are there any local mycology stores here?
There’s a couple stores that sell various types of fungi and spices here in Denver.  You could try doing a web search for them, using your phone or computer, and then visiting the store and asking them where the mushrooms are.  I can show you some pictures if you like, and also give you driving directions.  Does that sound helpful?
Mycology refers to the study of fungi, the kingdom of life with which humans are perhaps most familiar.