Sceptre U550CV-UMC 55″ 4K Ultra 60Hz LED HDTV for $399.99 shipped. Here is a screenshot for reference. It features an ultra high resolution of 3840 x 2160, 4K UHD upscaling, 60Hz refresh rate, and inputs for 4 HDMI, and more.
Originally posted earlier, this post has been revised. Thank you, Jon!