This Forbes article reports that worldwide pre-order sales of Harry Potter and the Deathly Hallows was 1.6 million. That tops their previous all time high record for pre-order sales, which was also held by Amazon which for 1.5 million pre-orders which happened to be for the sixth Harry Potter book (Harry Potter and the Half Blood Prince).
Amazon guaranteed their customers would be charged the lowest price that was offered. I am not sure if that is an International guarantee or if in America they are going to price the pre-orders by the lowest price the book was sold for in America. I read in two articles, that one store in England was selling the book for 4.99 pounds (about $10 US Dollars). Here is one article on Boston.com that discusses the lowest price that the Harry Potter book sold for.
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