Amazon Warehouse Deals offers the used Dell UltraSharp U2713HM 27" LED-Backlit IPS LCD Monitor, model no. CVN85, for $401.95 with free shipping. That's $148 under our mention of a new unit from three weeks ago and the lowest total price we've seen for this monitor. (It's also $198 below the best price we could find for a new one today.) Features include a native resolution of 2560x1440, LED backlight, 4-port USB 3.0 hub, and DisplayPort, HDMI, DVI, and VGA inputs.

Update: The price has dropped slightly to $401.42.