B&H Photo-Video offers the Qnap Turbo 4-Bay Gigabit Ethernet Network Attached Storage Enclosure (pictured), model no. TS-469L-US, for $509 with free shipping. That's the lowest total price we could find by $115. Designed for SMBs, it features room for four 3.5" or 2.5" Serial ATA hard drives or SSD drives (none are included), an Intel Atom 2.13 GHz dual-core processor, 1GB RAM (expandable up to 3GB), two Gigabit Ethernet ports, and two USB 3.0 ports.

Of note, the Qnap Turbo 5-Bay Gigabit Ethernet Network Attached Storage Enclosure, model no. TS-569L, is available for $529 with free shipping, a price low of $214. Both deals end June 15.