Amazon America currently has LEGO Ninjago 70503 The Golden Dragon on sale for $23.49 (reg.$29.99). Savings work out to be 22% off. Free shipping on orders above $25 and no tax for most states.
LEGO Ninjago Ultra Sonic Raider is also down to $57.99 (reg.$79.99) which works out to be 28% off. More of their hottest LEGO deals can be found here.