Amazon offers the second-generation Samsung SmartThings Hub for $49.98 with free shipping. (Home Depot and Samsung charge the same.) That's tied with our September mention, $50 off, and the lowest price we could find. The hub allows you to connect all of your smart locks, lights, outlets, and thermostats and control them with your smartphone via the free SmartThings app. It's compatible with iOS, Android, and Windows Phone.