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Since April 1, Amazon.com has sold 105 e-books, not including free e-books, for every 100 print books. ((Brian Snyder/Reuters))

Online bookstore Amazon.com now sells more e-books than all hardcover and paperback print books combined.

"We had high hopes that this would happen eventually, but we never imagined it would happen this quickly," said Jeff Bezos, founder and CEO of Amazon.com in a statement Thursday announcing the milestone.

Since April 1, Amazon.com, the company's U.S. site, has sold 105 e-books, not including free e-books, for every 100 print books. Amazon said it does not have any specific stats to share for Canada, where the national site is Amazon.ca.

Bezos noted that the Seattle, Wash.-based company has been selling print books for 15 years and e-books for less than four. Amazon introduced its Kindle e-book reader in 2007.

Kindle e-book sales overtook hardcover sales in July 2010 and paperback sales this past January.

Amazon's e-books can be read on Amazon's Kindle e-readers as well as on desktop and laptop computers and a variety of mobile devices, such as the Apple, Windows, Android and BlackBerry smartphones and tablets.

Amazon also announced Thursday that a new Kindle e-reader with ads is outselling other Kindle models in the U.S.

The Kindle with Special Offers, introduced in April, costs $114 — $25 less than the next lowest-priced Kindle.