The latest installment of the Harry Potter series has already sold 750,000 at a US book store, beating the amount for the last book back in June 2003.
Harry Potter and the Half Blood Prince has also sold 500,000 copies on pre-order on the Amazon website, and Barnes and Noble are predicting over a million pre-orders before the book is released.
Three of the books have already been made into films and the fourth installment to be released in cinemas in November.
Daniel Radcliffe, who plays Harry Potter has also just signed up for the fifth film, Harry Potter and the Order of the Phoenix.
The sixth book in the hugely successful series is out on July 16 in both the US and the UK.
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