WD Black 4TB Performance Desktop Hard Disk Drive – 7200 RPM SATA 6Gb/s 128MB Cache 3.5 Inch – WD4004FZWX $170

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Newegg has WD Black 4TB Performance Desktop Hard Disk Drive – 7200 RPM SATA 6Gb/s 128MB Cache 3.5 Inch – WD4004FZWX for $170 + fs after promo code 80307EDST18. The lowest price so far.