Walmart offers the TCL 55" 4K 2160p WiFi LED-Backlit LCD Ultra HD Roku Smart Television, model no. 55S405, for $399.99 with free shipping. (Best Buy charges the same.) That's tied with our mention from three weeks ago and the lowest price we could find now by $50. It features a 3840x2160 (2160p) native resolution, content streaming via Roku TV (including Netflix, Youtube, and Hulu Plus), 802.11ac wireless, USB, and three HDMI inputs.

Update: The price has increased at Walmart; however, Best Buy still offers it for the same price.