Amazon has the Panasonic VIERA TC-P50XT50 50" 720p 600Hz 3D Plasma HDTV (2012) for $541 with free shipping. Office Depot has it for the same price.
1024 x 768 resolution, 600Hz Sub-Field Drive, built-in Wi-Fi VIERA Link, 2D-3D conversion, 2x 10W speakers, 2x HDMI inputs
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Amazon for $541