Green-Sum via eBay offers the refurbished TopSynch Luxury 27" LED-Backlit LCD Monitor, model no. 2700QWB, for $179 with free shipping. That's $51 off and the lowest total price we could find. It features a 2560x1440 native resolution and dual link DVI input.
A warranty is included, but the terms are unclear.
Note that it's not compatible with laptops and Mac computers.