Microsoft Corp. may have sold out of the initial run of the $499 version of its Surface tablet, according to ordering information on the company's website.

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The device, a 32-gigabyte machine, was offered Tuesday for a limited number of early orders ahead of the Oct. 26 release. Microsoft's orders site has gone from guaranteeing the $499 model -- the cheapest -- for delivery by Oct. 26 to requesting that customers "order now for shipment within three weeks," indicating the first batch has sold out.

The $599 model, which includes a black touch cover, and the $699 64-gigabyte Surface, also with a black cover, are still available for delivery by Oct. 26.