Best Buy offers the Westinghouse 54.6" 4K LED-Backlit LCD Ultra HD Smart Television, model no. WE55UC4200, for $449.99 with free shipping. That's the best deal today by $250 and tied with our February mention as the least expensive 55" 4K Smart TV we've seen. It features a 3840x2160 (2160p) native resolution, WiFi, streaming apps (including Netflix, Vudu, and Pandora), USB 3.0, and three HDMI inputs. Deal ends April 25.