Figures may also have been depressed by the fact there were fewer releases this November than a year earlier when Uncharted 3, Skyrim, Lego Harry Potter 5-7 and Modern Warfare 3 were among titles that went on sale.

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With Prime, Kindle owners can read for free - choose from over 180, 000 books in the Kindle Owners' Lending Library, including all 7 Harry Potter books in 5 languages and over 100 current and former New York Times bestsellers, to borrow for free - as frequently as a book a month, with no waiting and no due dates.

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While "The Casual Vacancy" sold 1.5 million copies, that pales in comparison with the last Harry Potter book, "Harry Potter and the Deathly Hallows, " which sold 15 million copies in a single day when it was released in July 2007.

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