Americans with diabetes are forming caravans to buy Canadian insulin at 90% off

Because pharmacists are not the people who make decisions about how much of a drug is available. That’s the same false narrative you’ve pushed since we began this discussion. As I’ve said already, by and large pharmacists work for corporate owned businesses. The corporations handle the supply chain management and the manufacturer determines the ultimate availability of any given drug in any given area.
You paint a picture of a limited nonrenewable drug supply (which is false) whose distribution is determined by individual pharmacists (which is false) being in short supply because stocks of the drug are not readily available from other locations (which is false)