Insulin is totally free here...It’s true but I think the US has much higher prices for the same medication than most (if not all) countries in Europe (even if you include medication bought by European public medical services)
A random google, shows the ridiculous example of insulin, I have not fact checked the link below …
TechTarget Enterprise Technology News | Health IT
pharmanewsintel.com
You cannot buy it, it can only be prescribed, and when prescribed it is free.