Best Buy via eBay offers the open-box Dell 27" 1440p GSync LED-Backlit LCD Gaming Monitor, model no. S2716DGR, for $425.99 with free shipping. That's tied with our mention from three weeks ago and $151 below the lowest total price we could find for a new display. It features a 2560x1440 (1440p) resolution, USB, and DisplayPort and HDMI inputs.
Note: A warranty is included, however the details are unclear.