Surplus Products via NeweggFlash offers the refurbished HP Z420 Workstation Intel Xeon E5 6-Core 3.2GHz Desktop PC for $379.99 with free shipping. That's $10 below our August mention of a similar model (which featured Windows 10 Pro), $320 off, and the lowest total price we've seen for this configuration with any Windows OS. It features an Intel Xeon E5-1650 3.2GHz Sandy Bridge six-core processor, 8GB RAM, 250GB hard drive, DVD burner, Gigabit Ethernet, and Windows 7 Professional 64-bit. Deal ends October 18.

Note: A 90-day Surplus Products warranty is included.

Update: Coupon code "MPGAMER16" knocks it to $354.99 when checking out with MasterPass.