Dell Small Business offers its
Dell PowerEdge T30 Intel Xeon E3 3.3GHz Mini Tower Server for
$329 with
free shipping. That's tied with last month's mention as the lowest price we've seen. (It's the best deal now by $144.) It features an Intel Xeon E3-1225 v5 3.3GHz Skylake quad-core processor, 8GB RAM, 1TB 7200 rpm hard drive, DVD burner, and Gigabit Ethernet.
Note: It doesn't include an operating system.