Walmart offers the Panasonic CX400 Series 50" 4K 2160p WiFi LED-Backlit LCD Ultra HD Smart Television, model no. TC-50CX400U, for $499.99 with free shipping. That's $250 below our February mention, a current best by $150, and within $2 of the best outright price we've seen for any new 50" 4K Smart TV. It features a 3840x2160 (2160p) native resolution, Smart TV apps (including Hulu Plus, Netflix, and YouTube), USB 3.0, and two HDMI inputs.