My daughter uses the audio books all the time but she just gets them from the library. Amazon.com has tons of them.................just click under our resources to the right and you will find Amazon's link.
My daughter has to do some long distance driving when showing her dogs so she always has a supply of audio CDs with her. She swears they are the only thing that help her relax when driving long distances.
Good Luck and hope you try one to see how it helps you.
Hugs
Kitt