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Go Hard Drive via eBay has Factory Refurbished: 18TB Seagate Exos X20 3.5″ 7200 SATA 6Gb/s Enterprise Hard Drive (ST18000NM003D) on sale for $159.99. Shipping is free (via USPS Priority Mail)

Thanks to Deal Hunter tDames for finding this deal

Note, product is factory refurbished and is in excellent condition.