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I pre-order to my kindle for pc rather than a specific kindle, that way it ensures delivery. However whether you sent it to an unavailable device it should still be available to be downloaded on the kindle still in your possession. As to the re-ordering what you have already pre-ordered, I have no advice but to suggest you check your Manage Your Device page first, though I will say I have done this a few times and Amazon never let me re-order the same book on a second order.
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