Sam's Club offers its members the Vizio 65" 120Hz 1080p WiFi LED-Backlit LCD Smart HD Television, model no. D650I-C3, for $698 with free shipping. (Non-members pay $69.80 more, so it's best to sign up for a 1-year membership for $45.) That's the lowest total price we could find by $202 and the least expensive Vizio 65" Smart TV we've seen with a 120Hz refresh rate.
It features a native resolution of 1920x1080 (1080p), 120Hz refresh rate, full-array LED backlight, WiFi, Vizio Internet Apps Plus (including Netflix, Amazon Instant Video, and Hulu Plus), USB, and three HDMI inputs.