Tech Bar via Amazon offers the Samsung 55" 120Hz 1080p WiFi LED-Backlit LCD HD Television, model no. UN55F6300, for $829.99 with free shipping. That's $9 under our November mention and the best price we've seen for this TV new. (It's also current low by $100, outside of other Amazon sellers.) It features a native resolution of 1920x1080 (1080p), WiFi, 120Hz refresh rate, USB, and four HDMI inputs.
Note: It's not guaranteed to arrive in time for Christmas.