YSK that Walmart sells regular and 70/30 insulin vials for $24.88 and $42.88 apiece over the counter. It's not the current best regimen available, but if you are uninsured or break your vial, it can prevent diabetic ketoacidosis in a pinch.
from /r/YouShouldKnow
YSK，沃爾瑪在櫃檯上出售普通和70/30胰島素小瓶，每瓶24.88元和42.88元。這並不是目前最好的方案，但如果你沒有保險或打碎了你的小瓶，它可以在緊要關頭預防糖尿病酮症酸中毒。