Amazon America currently has LEGO Star Wars Imperial V-Wing Starfighter on sale for $14.97 (reg.$19.99). Savings work out to be 25% off. Free shipping on orders above $25 and no tax for most states.
They also got LEGO City Prisoner Transport on sale for $15 (reg.$19.99) as well. More of their hottest LEGO deals can be found here.