Currently, there's a Whispersync for Voice sale where you can buy the audiobook for 99 cents (if you already have or buy the Kindle book). It's a pretty nice selection.
http://www.amazon.com/gp/feature.htm...cId=1001385801
I can personally recommend the Retrieval Artist books by Kristine Kathryn Rusch. I've listened to the first three and they're great scifi mysteries. The narration is good too.
The White Trash Zombie books by Diana Rowland are great too but I haven't listened to the audiobooks. I originally bought them for the title and totally didn't expect them to actually be good books.