If I couldn't order from Canada I'd be in bed on full time oxygen, or dead. Walmart drug prices would leave me with about $100.00 a month to live on, food, shelter, everything. The drug companies are global, America is their cash cow, we pay the bills, the rest of the world gets the cheap pills!
Pharma's R&D costs of yester-year are substantially less today. Computer modeling has done that.
Like wise, Phama's purification costs have been reduced because of instrumentation and automation.