Dell UltraSharp U2913WM 29" (2560 x 1080) monitor delivered for $419 by Dell
That means you can get it delivered for $419.
It's a bit heavy on power consumption but a good option for those who prefer having a single wide monitor over two screens which take up more space on your desk.
Offer ends on the 20th June 2013.
NanoByte Solutions has the same model going for $599.