Audio book downloads are available from a wide range of online stores. Best sellers are made into digital audio books within weeks of their publication, but you can also download and listen to books that have been published years ago. Most of the CDs and cassette recordings have also been turned into downloadable books, so my guess is that you will find most of the books you want in audio book format. You can get classic novels, New York Times bestsellers, business-related books, self-help guides, and virtually any category you can think of. These digital libraries stock tens of thousands of titles.