Adorama Camera offers its Dell 27" 4K Ultra HD IPS LED-Backlit LCD Monitor, model no. P2715Q, for $554.99. This $100 mail-in rebate drops it to $454.99. With free shipping, that's $70 under our January mention and the lowest total price we've seen. (It's a current low by $100.) It features a 3840x2160 native resolution (four times that of 1080p), LED backlight, four USB 3.0 downstream ports, one upstream USB port, HDMI, DisplayPort, and mini DisplayPort.