US here. I only managed to do it because of a loophole. My wife has the beetus, and with insurance we pay $40 a month, without insurance it is about $600 for a month, so stockpiling it is effectively impossible.

Luckily during her last pregnancy my wife was prescribed substantially more insulin than she'd previously need for a month because the pregnancy was messing up her blood sugar, it stopped once she had the baby, but we still have the same dosage right now, so we are accumulating a small amount. That being said, it was the only way we could figure out to do it.