Walmart offers the Panasonic CX400 Series 50" 4K 2160p WiFi LED-Backlit LCD Ultra HD Smart Television
, model no. TC-50CX400U, for $449.99
with free shipping
. That's tied with last week's mention as the best price we've seen for this model. (It's a current low by $149.) It features a 3840x2160 (2160p) native resolution, Smart TV apps (including Hulu Plus, Netflix, and YouTube), USB 3.0, and three HDMI inputs.