I get mine from Tractor supply.....
I get mine online in 12 mg tabs at buyivermectin24.com. Indian website but they have not failed for the 4-5 times that I have purchased online. It takes 3-4 weeks for delivery.
My employees also take the Injectable IVM for beef cattle in orange juice. A couple of cc’s monthly.
Even after the Covid debacle, I still take IVM (36 mg) on the 1st and 15th of every month.