Sears continues offers the Zenith 50" 600Hz 720p Plasma HD Television, model no. Z50PT320, for $499.99. Choose free in-store pickup to avoid the $69.99 shipping charge. That's $150 off, tied with our mention from last week, and among the least expensive 50" plasma HDTVs we've seen. Sales tax is added where applicable. Features include a 1024x768 (720p) native resolution, 600Hz refresh rate, 2,000,000:1 contrast ratio, three HDMI inputs, and VGA and other inputs.