As I vaguely recall, the reason the same drugs are available in Canada at a lower price is because somehow the US taxpayers are subsidysing the American drug companies for the drugs they are forced to sell to Canada.
Therefore, by selling Canadian drugs in America, buyers are buying drugs subsidized by the US taxpayer. Sort of sliding into a National Health System for presciptions.
I would be very appreciative to anyone who heard that show, and has a better memory than mine.