It gets released in North America on May 28th

Harry Potter Becomes Fastest Selling British Video
Boy wizard Harry Potter may have weaved a little magic over the weekend to ensure the video and DVD release of “Harry Potter and the Philosopher’s Stone” broke British industry sales records.
Warner Home Video said on Sunday over 1.25 million copies of the big screen hit, known as “Harry Potter and the Sorcerer’s Stone” in the United States, sold on Friday, May 10th, 2002, its first day of release, breaking the previous record set by “Titanic” of 1.1 million copies.
The British record is for the number of units sold in a 24-hour period.