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Audible is AWESOME! If you haven't tried listening to audiobooks I recommend you give it a go. I know that I can't imagine reading without having the audio companion along. Audible is also an Amazon company and very often they offer the audio companion through their Whispersync tool which lets you automatically download the audio companion for the e-book you've just purchased. What's even better about this is that they will offer the audio companion for a discounted price.
The link will take you to the page that will automatically scan your e-book purchases for it's audio companion. I have gotten many audio companions for as little as $1.99.