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Audible was recommended to me and now I recommend it further because now it’s a part of my life!
For $14.95 monthly we get one free audiobook. And if we’d like to listen to more books, with the Audible membership we get nice discounts for most of the available audiobooks.
There is an iPhone app, allowing us to download and listen even without Internet connection.
Perfect for making 4-year-old sleep in the car 😉