AltaTac via eBay offers the refurbished ViewSonic 22" 1080p Touchscreen LED-Backlit LCD Monitor, model no. TD2220, for $189.99 with free shipping. That's the lowest total price we could find by $20. It features a native resolution of 1920x1080 (1080p), LED backlight, USB, and DVI and VGA inputs.
A 90-day warranty applies, although it's unclear who backs it.