Amazon.com hopes a bigger version of its Kindle electronic reading device can be a hit, even if it’s more expensive, and the company is aiming it in part at college students who are eager to save money on their textbooks.Kindle DX Wireless Reading Device (9.7″ Display, U.S. Wireless)Sleek & Trim Kindle DX is as thin as most magazines. Just over a third of an inch in profile, you’ll find Kindle DX fits perfectly in your hands. Beautiful Large Display Kindle DX’s large display is ideal for


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