BuyDig via eBay trimmed its price on the refurbished 6-lb. Asus Intel Haswell Core i7 1.8GHz 15.6" Laptop, model no. Q550LF-BSI7T21, to $579 with free shipping. That's $1 under our mention from January, the lowest total price we could find for a refurb by $91, and the best deal we've seen for this model. Features include an Intel Haswell Core i7-4500U 1.8GHz dual-core processor, 15.6" 1920x1080 LED-backlit LCD, 8GB RAM, 1TB hard drive, DVD burner, NVIDIA GT 745M 2GB graphics, 802.11ac wireless, Bluetooth 4.0, 4-cell battery, and Windows 8.1 64-bit. Deal ends March 9.

A 90-day warranty applies, although it's unclear who supports it.