Walmart offers the LG 55" 4K 2160p LED-Backlit LCD Ultra HD Smart Television, model no. 55UF6450, for the in-cart price of $515 with free shipping. That's $183 under last week's mention and the best price we've seen for any LG 55" 4K TV. (It's also the lowest total price we could find today by $184.) It features a 3840x2160 (4K) native resolution, webOS 2.0 Smart TV system, USB, and three HDMI inputs.

Update: It's now only available for in-store pickup.