NeweggFlash offers the Acer 27" S277HK 4K Ultra HD IPS LED-Backlit LCD Monitor, model no. UM.HS7AA.001, for $449.99 with free shipping. That's the lowest total price we could find by $21. (For further comparison, we saw a refurb for $390 shipped in January.) It features a 3840x2160 (4K) native resolution (four times that of 1080p monitors), LED backlight, built-in speakers, and HDMI, DVI, and DisplayPort inputs. Deal ends May 15.