I just (the last couple of days) went through the same amusing exercise in Kafkaesk bureaucracy. Kafka, of course, was an Austrian insurance adjuster, so he knew his stuff.
I was on 1 box of Humalog a month, I’m going to try using Fiasp because of insurance changes. After discussing this with my doctor we came up with a prescription for 20ml of Fiasp a month in vials; Omnipods take 2ml/pod and last 3 days, so a 30 day supply is 20ml. That part was easy. But I also need the Fiasp pens because sometimes I need to swap back to Lantus+fast-acting, and, anyway, they are a much better safety measure than vial+pod. So we came up with “5-10 units before meals, 5 pens per month” (there was some doctors office bad math there; I think I gave the number from this thread 
).
Anyway, proceed to Walmart, do not pass go, do not collect $100, vote as I tell you.
Now, some more bad math at Walmart, but I do get out my calculator, come up with 3 pens (10IU/meal, three meals a day) and realize that I forgot the air shot. Oops.
Two hours later, a telephone call from Melissa, who runs my doctor’s office, I remember the air-shot, we get to 40IU per day; four pens.
Today, I get to Walmart, two vials of Fiasp, three pens, in a zip-lock baggy of course (don’t all drugs come that way?) Fair enough, in the real world, not the world we live in at present, I need the pens for emergencies and vacations, where I don’t carry vials because 18 hours on an aeroplane followed by several hours in a taxi will probably kill these modern GE insulins. Three is actually what I wanted, the only reason I got it is because I am good at numbers and my wife is good at people.