All of my medications come through the VA medical system because I am a disabled veteran. Some of my medicines are free and some cost me $7.50 I can live with that.
When my son was young and my insurance did not cover his medications for his asthma, you're darn tootin' that I did comparison shopping. When we were living in Alamogordo, NM, I even went to Juarez to buy his medications. The inhalers were the same as this side of the border but so much cheaper. I could buy a three month supply of his 3 inhalers for what it would cost me to buy a one month supply for them in the USA.
I could also buy a blister pack of 100 prednisone pills for $1.00 in Mexico. The only difference in the prednisone that the doctor could see was the filler used in making them. He thought that it might take a little longer for the prednisone to work effectively.