$21 When you pour in a hot drink, it turns from "I Solemnly Swear That I Am Up To No Good" to "Mischief Managed." In addition, the 11-ounce mug also also turns from black to white, completing the transformation.... UMM AWESOME. I definitely need this in my life!
Harry Potter journals --JKR you need to write a Potions book that belonged to the Half-Blood Prince with Snape's scribbles in it!! And while you're at it, make a Standard Book of Spells, Divination book, Transfiguration book, Hogwarts: A History, Herbology book, and History of Magic!
DIY Harry Potter Textbooks!!! So awesome!! A party for an 11 year old - Send them a Hogwarts letter a couple days or weeks after their birthday, then take then to "Diagon Alley" (your backyard or basment, just a large space) And have them "buy" all their equipment for Hogwarts! Go back inside your house and show them a couple cool science tricks for potions or charms!!!