Amazon America currently has LEGO Ninjago 9450 Epic Dragon Battle on sale for $91.75 (reg.$119.99). Savings work out to be 24% off. Free shipping on orders above $25 and no tax for most states.
LEGO Teenage Mutant Ninja Turtles 79102 Stealth Shell in Pursuit and LEGO Ninjago 70502 Cole Earth Driller are also available for $15.97 each (reg.$19.99) which works out to be 20% off. More of their hottest LEGO deals can be found here.