I am an avid audio book listener. Lately I am heavily into Podcast Novels. Try
www.podiobooks.com All free to download and a great range. You can d/l them through iTunes. I recommend 7th Son by JC Hutchins (a bit sci-fi but great story).
What I usually do is find an audio CD on amazon and then see if iTunes or Audible has it and get them there.
Novelists that have great audio stuff include Lee Child (the best thriller writer out there) and most of Stephen Fry's stuff. Then there's your standard guys like Dick Francis, Tom Clancy, James Patterson, John le Carre, etc.
Start with the Lee Child - Killing Floor and then get them in chronological order. They are amazing.