Adorama offers the Lenovo S510 Intel Skylake Core i5 2.7GHz Small Form Factor Desktop PC, model no. 10KY002BUS, for $339 with free shipping. That's $11 under our October mention and the lowest total price we could find now by $65. It features an Intel Core i5-6400 2.7GHz Skylake quad-core processor, 4GB RAM, 500GB 7200 rpm hard drive, DVD burner, Gigabit Ethernet, USB 3.0, DisplayPort, and Windows 10 Professional 64-bit.
There's a less expensive way, and then there's the way that works for you. The two may not be the same.