Newegg offers the refurbished Asus 1080p 21.5" LED-Backlit LCD Monitor, model no. VS228H-P, for $91.99 with free shipping. That's $28 below the lowest total price we could find for a new monitor. It features 1920 x 1080 resolution, 50,000,000:1 contrast ratio, 5ms response time, and HDMI, DVI, and D-Sub inputs.
A 90-day warranty applies, but it's unclear who backs it.