Amazon.com Inc. said Tuesday it had booked more than 1 million advance orders for "Harry Potter and the Deathly Hallows," scheduled for release in late July.

The online retailer also lowered its price on the book to $17.99 from $18.89. It said it would honor the lower price for customers who had already ordered the book, the seventh in the wildly popular series by J.K. Rowling about a boy wizard and his struggle against the forces of evil.

More than 620,000 copies have been ordered in advance in the United States, with more than 250,000 in the United Kingdom, Amazon (AMZN) said. Advance orders for this book have surpassed those in 2005 for Rowling's sixth release, "Harry Potter and the Half-Blood Prince."

In April, Barnes & Noble Inc. (BKS) said that advance orders for the book had topped 500,000 copies, breaking the bookseller chain's record for the most advance requests in its history.

The book, which is published in the United States by Scholastic Corp. and in Britain by Bloomsbury , officially goes on sale on July 21.