Amazon USA currently has LEGO Pirates of the Caribbean 4183 The Mill on sale for $18.99 + $6.99 shipping which works out to be $25.99 (reg.$39.99). Savings are 35% off and it also appears that the more you buy, the cheaper the shipping which means better savings. (its from a third party seller)
They also have City Police Station for $68.4 (reg.$99.99) which works out to be 32% off and Star Wars Tie Fighter for $41.8 (reg.$54.99) which works out to be 24% off. More of their hottest LEGO deals can be found here.