TigerDirect offers the Planar Helium PCT2785 27" 1080p Touchscreen LED-Backlit LCD Monitor, model no. 997-6848-00, for $699.99 with free shipping. That's the lowest total price we could find by $108. It features a projected capacitive multi-touch display with 1920x1080 (1080p) native resolution, edge-lit LED backlight, webcam, USB, and DisplayPort, HDMI, and VGA inputs.
Note: The touchscreen function is only compatible with Windows 7 and 8.