At www.sacredspores.com they carry guaranteed 100% sterile spores for viewing, and live edible mushroom cultures. Cubensis, panaeolus cyanesence, Shittake, Miataka, Osyters, and more! Check them out for all your growing concerns.
Friend, I'm not sure if you're aware, but alot of folks might see that "100% sterile spores" and think that the spores are not contaminant free but rather sterile as in unviable / unable to produce mycellum. So mabey 100% Viable might be better wording, unless of course they are in fact sterile and simply intended for study under a microscope. (But I somehow doubt that)