If you're near the Canadian border, I've heard some anecdotes about folks crossing to get cheaper insulin. I've not done it, though was on the fence about doing it.

Also, I know that some makers ( Eli Lilly in particular ) also offer need-based aid programs to provide insulin. If you reach out to them and they're manufacturing, I believe you can get the insulin at near free if not free. ( This is also true for many medications that fall into the commonly-used category, you can explore manufacturer sites to see if they provide aid for a particular drug that is in your list )