Walmart offers the Samsung 55" 4K HDR Flat LED Ultra HD Smart Television, model no. UN55NU6900, for $447.99 with free shipping. That's $30 under our mention from two days ago and the lowest price we could find now by $70, outside of the mention below. Features include:

3840x2160 (2160p) native resolution

HDR 10

Smart TV apps

2 HDMI inputs

A close price: Best Buy charges $2 more.