Understood but for many that is not a viable option as the costs for that type of delivery is more than some can afford I would imagine. I could be wrong but I was told that the pen method is a good bit more pricey than the vial and needle method.
You’re not wrong, it is much more expensive. The pens are extremely clever - genius, even - but are patented and still priced at monopoly levels.
Many health insurance plans have not only a flat co-pay but also a 10% or more coinsurance, and have price incentives for generic drugs, so people who are price-sensitive in these plans will opt for the vials instead.
It probably is more expensive but it would be a good option for traveling.