Altatac via eBay offers the refurbished HP Envy AMD Fusion A10 Quad 3.4GHz Desktop PC, model no. 700-406, for $399.95 with free shipping. That's $41 under the lowest total price we could find for an open-box unit. It features an AMD Fusion A10-7700K 3.4GHz quad-core processor, 12GB RAM, 2TB hard drive, DVD burner, 802.11ac wireless, Bluetooth 4.0, USB 3.0, and Windows 8.1 64-bit.

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