Microsoft Store offers the Dell 20" 1080p LED-Backlit LCD Monitor in Black, model no. D2015HM, for $79 with free shipping. Except for the mention below, that's the lowest total price we could find by $10, although we saw it for $104 bundled with a $50 Dell gift card in December. It features a 1920x1080 (1080p) native resolution, LED backlight, 60Hz refresh rate, and a VGA port.
A close price, Amazon and Adorama via Newegg have it for $79.99 with free shipping.