Of course, you can always use your library card and check out audio books from the Metropolitan Library System using a process similar to checking out a book to read on a mobile phone or tablet.
To check out from t he library, you have to have an app like OverDrive Media Console for audio books (and Adobe Digital Editions for eBooks), and the process of getting it to your book is at first cumbersome, but those books are always free.
If I were still driving long ways to work, a monthly subscription for a service like Audiobooks.com would be a welcome diversion for the commute. I will probably keep finding ways to use the service, even though I feel asleep testing it from the comfort of my couch.
Email app ideas to firstname.lastname@example.org. For more apps, go online to Blog.NewsOK.com/get-appy.