Don't know how many folks have heard about Libby, but I've used it for a couple years now.

Libby let's you browse your local library's digital catalogue, including all of their audio books. Books can be borrowed for up to 3 weeks, with the option to extend it a sling as there's no one waiting for it. Works on Apple, Android, and in your browser. Best of all, it's all free! I dumped Audible for it and haven't looked back.