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If you have already pre-ordered at a higher price, I'd recommend canceling that order and re-ordering at the new price (but do so quickly, after confirming the new price, as it can go up again at any time). Apparently the pre-order price guarantee at Amazon may not cover Kindle books, as they don't display the "Pre-Order Price Guarantee" banner that is required (and there are reports of people who have and haven't received lower prices on Kindle pre-orders).. Easy enough to order again, since it's only a couple of extra clicks.