Amazon is trying something new to take over the digital book and audio book market with a new service called Kindle Unlimited. The service will cost subscribers $9.99 per month and has a library that has about 600,000 books to read.
Unlimited will also reportedly feature thousands of audio books for users to listen to as well. The service hasn't been announced officially just yet, it was uncovered when a cached link to the service page was rooted out.
One potential downside is that the test pages found for Kindle Unlimited didn't show any of the big five publishers including Simon & Schuster or HarperCollins. However, both of those publishers do offer content to a similar service called Oyster. Amazon owns Audible so the entire 8000 title catalog there could be included.