Amazon United States currently has LEGO 10231 Shuttle Expedition on sale for $82.17 (reg.$99.99). Free shipping and no tax for most states.
They also have LEGO 10214 Tower Bridge for $208.8 (reg.$239.99) and 10221 Super Star Destroyer for $359.99 (reg.$399.99). More of their hottest LEGO deals can be found here.