Adorama offers the Samsung 40" 1080p WiFi LED-Backlit LCD Smart HD Television, model no. UN40H5500, for $377.99 with free shipping. (Amazon charges the same.) That's the lowest total price we could find by $170. Features include a native resolution of 1920x1080 (1080p), WiFi, internet apps including Netflix, Hulu Plus, and Amazon Video, USB, and three HDMI inputs.
A close price: Best Buy and Crutchfield offer it for $379.99 with free shipping.