A 90-day warranty applies but it's unclear who supports it.
Fry's Electronics offers the refurbished Hisense 55" 120Hz 1080p LED-Backlit LCD HD Television, model no. 55K610GW, for $497 with free shipping. That's the lowest total price we could find for a refurb by $43 and the least expensive 55" Hisense TV we've seen. It features a native resolution of 1920x1080 (1080p), 120Hz refresh rate, SmartTV Internet apps, built-in WiFi, four HDMI inputs, and USB.