Walmart offers the Panasonic VIERA X5 Series 42" 600Hz 720p Widescreen Plasma HD Television, model no. TC-P42X5, for $398 with free shipping. That's the lowest total price we could find by $70, outside of the price below. Sales tax is added where applicable. Features include a 1024x768 (720p) native resolution, 600Hz refresh rate, media card reader, USB connectivity, two HDMI inputs, and VGA and other video inputs.

A close price: Panasonic offers it for $399.99 with free shipping.

Of note, although Walmart says this HDTV has a 60Hz refresh rate, Panasonic confirms that the rate is 600Hz.