Tales of the Beedle Bard: The new edition of JK Rowling's latest book includes the five original fairytales from the first version, as well as extensive annotations by the famed Wizard Albus Dumbledore. Dumbledore's commentary adds more information on the history and magical sciences of the Harry Potter world. $7.14 from Amazon.
Harry, A History: The True Story of a Boy Wizard, His Fans, and Life Inside the Harry Potter Phenomenon: The webmistress of Harry Potter fansite The Leaky Cauldron, Melissa Anelli traces the history of Potter fandom and tries to explain the meteoric rise of Rowling's books. $10.88 from Amazon.
Varsity Quidditch Apparel: Now that Quidditch has become an intercollegiate sport, players and fans will need to display their allegiance to their favorite team. Gryffindor supporters can pick up their t-shirts and hoodies from CafePress.