Best Buy offers the Insignia 54.5" 4K 2160p WiFi LED-Backlit LCD Ultra HD Roku Smart Television, model no. NS-55DR620NA18, for $399.99 with free shipping. That's tied with our July mention, $100 off, and the lowest price we could find. It features a 3840x2160 (4K) native resolution, WiFi, Roku media streaming (including Netflix and Hulu Plus), USB, and three HDMI inputs.