Amazon offers the Dell UltraSharp U2713HM 27" LED-Backlit IPS LCD Monitor, model no. CVN85, for $649.99 with free shipping. That's tied with our mention from five days ago (which was available for Costco members only) and the lowest total price we could find by $99, outside of the mention below. Features include a native resolution of 2560x1440, LED backlight, 4-port USB 3.0 hub, and DisplayPort, HDMI, DVI, and VGA inputs. Note that it's currently out of stock, however it can be ordered at this price for delivery when available.

Of note, Costco still offers it for its members for the same price.