Harry Potter fans, unite! Walmart has a deal on the LEGO Harry Potter Hogwarts Castle and Grounds this week, and it’s such a rare sale that more than 100 people have it in their carts already.

LEGO's newest Harry Potter sets include the Room of Requirement, the Astronomy Tower, and the Attack on the Burrow. In addition to the Room of Requirement set, the new line also has the Death ...