Kmart offers the Zenith 50″ 600Hz 720p Plasma HD Television, model no. Z50PT320, for $499.99. Choose free in-store pickup to avoid the $90 shipping charge. (Sears charges the same.) That’s $150 off, tied with our mention from two weeks ago as among the least expensive 50″ plasma HDTVs we’ve seen. Sales tax is added where applicable. Features include a 1024×768 (720p) native resolution, 600Hz refresh rate, 2,000,000:1 contrast ratio, three HDMI inputs, and VGA and other inputs.