Walmart offers the refurbished Vizio 50" 1080p LCD HD Television, model no. E500AR, for $399 with free shipping. That's $201 off list, $30 under our December mention of a refurb, and tied as the best price we've seen for this model. It features a 1920x1080 (1080p) native resolution, USB, and three HDMI inputs.
A 90-day warranty applies, although it's unclear who backs it.