Amazon also unveiled new "origami covers" that lie flat when closed over the screen but can be folded and snapped into place as a stand that works both in horizontal and vertical position. They'll come in seven different colors and be sold separately for between $45 and $70.
The 8.9-inch Kindle Fire HDX starts at $379 for 16 gigabytes of memory, while the 7-inch starts at $229 also with 16 gigabytes. Buyers can order them starting Wednesday. The 7-inch will ship Oct. 18, while the 8.9-inch will ship starting Nov. 7.
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