Amazon just dropped 10 new book releases for the month of October. Prime members get exclusive early access, and they can download two Kindle books for free.

Estimating standard shipping to be roughly $6 per order, an Amazon Prime membership will pay for itself if you're making about two orders a month.

If you have Amazon Prime, you also get access to discounted Amazon Kids Plus. The subscription service features a range of ad-free content, including books, games and videos for children ages 3 to 12. Parents can limit the amount of screen time available to their children and manage up to four profiles on iOS and Android.

Starting Oct. 1, Amazon Prime customers wanting to share shipping benefits and added digital perks can do so using the Amazon Family program.