I'm afraid I can't help regarding finding a pharmacy selling Ivermectin. I've gone all-in with Tractor Supply and the horse paste. :)
LOL, I did the horse paste too when Covid first started and the human variety couldn’t be found.
The article I read yesterday had a list of TN pharmacies and there is one in Hixon but I can’t remember the name. The search engine on my phone is different than the one on my computer.