Acer via eBay offers the factory-refurbished Acer 28" 4K 2160p LED-Backlit LCD Ultra HD Monitor in Black, model no. CB280HK, for $239.99 with free shipping. That's $70 under our mention of a new one in December, $260 off, and the lowest total price we've seen in any condition. It features a 3840x2160 (4K) native resolution (four times that of 1080p monitors), LED backlight, DisplayPort, and one HDMI port. A 90-day Acer warranty applies. Deal ends March 20.