Amazon.com Inc
Chief Executive Jeff Bezos, taking the stage in Santa Monica, California, unveiled an 8.9-inch version called the Kindle Fire HD, as well as a smaller 7-inch version that will sell for $159.
Bezos on Thursday stressed that Amazon saw the Kindle family of e-readers and tablets as a service, with hardware a critical element of its digital content business.
Amazon is competing with Apple, Google Inc
Amazon is willing to make little or no money selling cheap tablets and e-readers because it wants to get the devices into as many hands as possible, then sell higher-margin digital content, such as e-books, video, games, apps and music, to a more connected and engaged customer base.
On Thursday, the company also showed off a "paperwhite" e-reader with a much sharper screen and longer battery life.
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The 3G wireless version that made digital readers mainstream will sell for $179 starting in October, in time for the crucial holiday season. A wifi-only version will go for $119, and the cheapest will carry a $69 price tag -- undercutting the cheapest Barnes and Noble
Shares in Amazon, which hit a high earlier on Thursday, were up 1.1 percent at $249.