Amazon America currently has the motorized LEGO Technic 9398 Rock Crawler on sale for $151.56 (reg.$199.99). Savings work out to be 21% off.
Other great deals include Creator 31011 Aviation Adventure for $42.89 (reg.$59.99) which works out to be 29% off and Super Heroes 76004 Spider-Cycle Chase for $14.73 (reg.$19.99). More of their hottest LEGO deals can be found here.