Brown-Box via eBay offers the refurbished Sharp Aquos 55" 4K 2160p WiFi LED-Backlit LCD Smart Ultra HD Television, model no. LC-55UB30, for $489.99 with free shipping. That's $60 under our June mention and the lowest price we've seen for this television in any condition. (It's $10 under the best we could find for a refurb today.) It features a 3840x2160 (2160p) native resolution, 4K upscaling, 802.11n wireless, Ethernet, Smart TV apps (including Hulu Plus, Netflix, and YouTube), USB, and four HDMI inputs.

Note: A 90-day warranty applies, but it's unclear who backs it.