As one of its daily deals, Amazon offers the Drobo 5N 5-Bay Network Attached Storage Array, model no. DRDS4A21, for $469.99 with free shipping. That's the lowest total price we could find by $99. Sales tax is added where applicable. This enclosure can hold up to five 3.5" serial ATA hard drives for up to 20TB total. It features Gigabit Ethernet and BeyondRAID technology, which chooses the correct protection algorithm based on data availability needs and allows switching from single to dual disk redundancy with a single click. Deal ends today.