Right now if you sign up for a 12 month membership to Audible you can get $100 off some different devices at Amazon. This includes some apple products and Kindles. It makes some cheap to free. I personally am already a member of Audible and love it. I get a book or two every month this way.
It charges me like $15 for the monthy service. They have an awesome selection and I think it is a great way and I use them on my device connected to my car radio. I am not sure how long this deal passess. Here is the link to find out more.