(Expired) Amazon: Lego Ultimate Building Set $19.97 (Reg $29.99) by maria Leave a Comment Amazon has the Lego Ultimate Building Set (405 pieces) on sale for $19.97 right now – regularly $29.99. Related posts: Pack Of 12 Water Bomb Splash Balls – Pool/Beach $6.88 Shipped! Wall Mount Grocery Bag Dispenser only $9.99 (reg. $30.19) Building Bricks and Minifigure Ice Cube Tray Just $7.61! Furby Boom Figure (Polka Dots) $33.10, Was $64.99!