Medicare capped the monthly price of insulin at $35 for all medicare patients. For commercially insured patients in the USA, you can use the coupon from this website to get $35 short-acting insulin like Humalog or Lyumjeg, and long-acting insulin like Basaglar (equivalent to Lantus). Learn more about this plan from Lilly Diabetes here.
If you'd rather use a non-Lilly insulin, Novo has a $99 monthly price of any combo of their insulins, such as Novolog, Fiasco, or Tresiba. Learn about the Novo program here.
If you do not have any insurance, most insurance companies have patient assistance programs that will significantly reduce the cost of insulin. Learn more about all the various companies patient assistance and coupon programs here.
I thought at the very least this would be a fitting first post for this community.