I know CVS and Walgreens typically have it on the shelf (I've seen it in Houston and BCS).
There is an organization called MCOPE (Montgomery County Overdose Prevention Endeavor) started by four moms who lost sons to opioids, that does an education event each year, where they do education of opioid abuse, mental health resources, recovery resources, etc. They also do Narcan training and pass out Narcan inhalers. It is in mid-August. Check out the MCOPe page on FB for details. We drive up from CS to volunteer each year.