Dell Small Business takes 15% off all Dell LCD Monitors via coupon code "ZXP20F740G$W11". With free shipping, that's puts most at the lowest total price we could find. Sales tax is added where applicable. Coupon expires December 1.

A best bet is the Dell UltraSharp U2212HM 21.5" 1080p LCD Display (pictured) for $237.15 after the above coupon. With free shipping, that's the lowest total price we could find by $27. It features a 1920x1080 (1080p) native resolution, 8ms response time, 2,000,000:1 dynamic contrast ratio, 250 cd/m² brightness, five USB ports, and DVI-D (with HDCP) and VGA video inputs.