Try Audible on Amazon Echo,

Amazon offers 4 audiobooks for FREE when you try Audible on Amazon Echo devices.

1. On any Echo device, say "Alexa, start my Audible trial" to start and follow the prompts to sign up.
2. Four credits which can be exchanged for any audiobooks will be applied to the account registered to your device. Ask Alexa for any book to redeem them, or browse audiobooks to find a title.
3. Listen on your Echo and download the Audible app for iOS or Android to take your story on the go. Keep your place even when you switch devices. After one month, your Audible membership will renew at $14.95 for 1 audiobook credit/month. Cancel anytime.