Walmart offers the Proscan 55" 4K 2160p LED-Backlit LCD Ultra HD Television for $279.99 with free shipping. That's $20 under our expired mention from yesterday and not only the best price we've seen for this TV but also among the least expensive new 55" 4K UHD TVs we've ever seen. (It's a current low by $88.) It features a 3840x2160 (2160p) native resolution, USB, and three HDMI inputs.
Walmart offers the Proscan 50" 4K LED-Backlit LCD UHD Television for $269.99. Opt for in-store pickup to avoid the $45 shipping fee. That's the lowest price we could find by $90. It features a 3840x2160 (4K, 2160p) native resolution, 4K upscaling, and four HDMI inputs.