Walmart offers the refurbished Samsung 54.6" 4K HDR Flat LED Ultra HD Smart Television, model no. UN55MU800D, for $459.99 plus $19.97 for shipping. That's tied with our mention from three weeks ago and $120 less than the lowest price we could find for a new unit. Features include:

3840x2160 (4K) native resolution

HDR Extreme

802.11ac wireless & Bluetooth

Smart TV with Apps (including Netflix, Amazon Video, Hulu, more)

voice control

3 USB ports & 4 HDMI inputs

Note: A 90-day warranty applies, but it's unclear who backs it.