Walmart offers the refurbished LG 50" 120Hz 1080p LED-Backlit LCD HD Television, model no. 50LB5900, for $329.89 with free shipping. That's $45 under our February mention of a new unit (after an included $125 gift card) and the lowest total price we've seen for this TV. (It's also $169 below the best price we could find for a new one today.) It features a 1920x1080 (1080p) native resolution, 120Hz refresh rate, LED backlight, USB, and two HDMI inputs.
Note: No warranty information is provided. Walmart lists the refresh rate at 60Hz, but we find it at 120Hz per the specs at LG (MCI, or Motion Clarity Index, is 240; equivalent to a 120Hz refresh rate).