One of the coolest Lego Super Mario expansion sets is on sale for the first time at Amazon and Target: King Boo's Haunted Mansion. Released in August for $75 alongside the revamped starter kits for Mario, Luigi, and Peach, the 932-piece expansion kit is discounted to $60. It's one of numerous Lego Super Mario sets in Target's Early Black Friday Sale, which runs through November 9. Amazon is matching this deal and several others as well as offering deals of its own.