The SanDisk G-RAID Mirror external Thunderbolt-powered RAID hard disk is currently the cheapest for both the 48 TB and 16 TB variants.
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The TerraMaster F2-423 2-Bay NAS enclosure is great for home server setups or small businesses. It's available at an all time low price at Amazon of $239.99 with the use of a $60 digital coupon.
Western Digital's My Cloud Pro 4-bay NAS is now available on Amazon with a massive $300 discount. In addition to a solid 4-bay enclosure, you get an extra four hard drives with 24TB of total capacity.