Seiki via Newegg offers the Seiki 42" 4K 2160p LED-Backlit LCD Ultra HD Television, model no. SE42UM, for $309.99. Apply coupon code "VCOBF15" and pay with Visa Checkout to cut it to $284.99. With free shipping, that's $13 under our July mention and the lowest total price we've seen. (It's also the best deal today by $29.) It features a native resolution of 3840x2160, LED backlight, USB, and three HDMI inputs.
Note: The coupon can only be used once per account.