From the Montana DPHHS website:

Narcan nasal spray is available to individuals at locations identified on the map below, formal training is not required, basic instructions are available, and additional resources are being developed to for community use purposes.  Montana’s Good Samaritan Law  provides legal protection to those who administer naloxone, even if they are using substances too.  Naloxone is also available from these  Pharmacy Locations  pending insurance approval. To see locations and provider information, please follow this LINK to the Montana DPHHS website for the most current list of locations/providers.