I'm no expert on disk prices, but this seems like a good deal for a 14 TB Toshiba disk:
eshop.macsales.com
Toshiba MG07ACA14TE 14.0TB MG07ACA Series 3.5-inch... at MacSales.com
14.0TB Toshiba MG07ACA14TE MG07ACA Series 3.5-inch SATA 6.0Gb/s (3.0Gb/s and 1.5Gb/s backwards compatible) 7200RPM Enterprise Class 9-Disk Hard Drive with 256MB Cache. 512e sector model.