Ends tomorrow at 10PM PT. Dell Business has the Dell UltraSharp U2413 24" 1920 x 1200 IPS LED LCD Monitor for $500 with free shipping. Includes a $100 Dell gift card with purchase. Many connections including DVI-D, DisplayPort, Mini DisplayPort, HDMI and four USB 3.0 ports. Here's CNET's review of this successor to the UltraSharp U2412M.
1920 x 1200, 16:10 aspect ratio, 350 cd/m2 brightness AH-IPS panel, 6ms response time, 1000:1 native contrast ratio