I have long been a road warrior and so have been listening to audiobooks for years. Cracker Barrel was my introduction to this medium of "reading". They still have a great deal on their audio books. You pay full price for the "book", but you can bring them back and get a refund less the weekly charge. It used to be $3/week, but it's been it's been a few years since I was last there so it could be more.
These days I download audiobooks from iTunes. The drawback of downloads from this source (or from eMusic, Audible.com, etc.) is you pay full price for a book you most likely will just...