I just found out about another Amgen program thanks to a post by @dianeg77 in the "Evenity Cost" thread. https://connect.mayoclinic.org/comment/999636/
It's the Amgen Support+ Co-pay Program. It's like other co-pay assistance programs where you're given a card with a benefit value that you can use towards your co-pay or co-insurance. With Evenity, the benefit amount is $8000 and you get 3 years to use it.
I enrolled, and got the card details straight away. I've scheduled my first injection after conferring with three specialists who all agree that it's the best treatment for me at this time.