Walmart offers the Asus 27" 4K Ultra HD LED-Backlit LCD IPS Monitor in Black, model no. PB279Q, for $599 with free shipping. (Jet.com and Amazon offer it for the same price.) That's the lowest total price we could find by $40. It features a 3840x2160 native resolution, LED backlight, four HDMI inputs, DisplayPort, and Mini DisplayPort inputs.