Kindle has been Amazon’s #1 bestselling item for two years running and the best e-reader on the market, is now even better.

The all new Kindle is smaller, lighter, and faster. The new Kindle features built-in Wi-Fi, 50% better contrast for sharper fonts and clearer text, more than double the storage capacity, a new graphite color option and more—all for just $189, and still with free global 3G wireless—no monthly bills or annual contracts.

Amazon has also introduced a new addition to the Kindle family of reading devices—Kindle Wi-Fi, a Wi-Fi only model for just $139. The new Kindle and Kindle Wi-Fi are now available for pre-order at Amazon and they will ship to customers in late August.

The Kindle Store now has over 630,000 books and the largest selection of the most popular books people want to read, including 109 of 112 New York Times Bestsellers and New Releases from $9.99. Since its release, Kindle has been the #1 bestselling product across the millions of items sold on Amazon.