Newegg offers the Synology 8-Bay Diskless NAS Server, model no. DS1815+, for $859.99 plus $4.99 for shipping. That's the lowest total price we could find by $23. It features a 2.4GHz quad-core processor, 2GB RAM (expandable up to 6GB), four USB 3.0 ports, four Gigabit Ethernet ports, room for eight SATA hard drives, and up to 108TB storage capacity.

Update: The price has dropped to $839.99.