Author J K Rowling beat her record for the sixth instalment of Harry Potter and the Half Blood Prince in 2005 with the seventh and final instalment named Harry Potter and the Deathly Hallows. ASDA (part of Wal-mart) sold the hardback at a loss, charging only £5 for the last instalment, a friction of the recommended retail price of £17.99. The discount paid off, as 97% of its 500,000 copies were sold within 36 hours of publication on Friday, 20th July 2007. Publisher Bloomsbury said British sales could reach 3million in the first day – up from 2million with Half Blood Prince. Waterstone’s bookstores sold 100,00 books in two hours, with WHSmith selling 15 books a second on Friday night. Online retailer Amazon.com had 2.2million pre-orders – up 47% on the sixth instalment.