Ebay offers Refurbished HGST Ultrastar DC HC520 12TB SATA 6Gb 256MB 3.5" Enterprise HDD for $74.99 with free shipping.

Product Description:
HGST Ultrastar HC520 12TB HARD DRIVE -HUH721212ALE601 delivers the world’s first hermetically sealed, helium hard drive, the Ultrastar® He10 for massive scale-out environments. Why does helium make a diference? Helium has only one-seventh the density of air. Replacing air with helium inside a hard drive dramatically reduces the turbulence caused by the spinning disks, cuts power consumption and results in a lower temperature within the disk drive.The reduction in turbulence for the spinning disk allows WD / HGST to deliver a seven-disk design in a traditional 3.5-inch form factor. In addition to being the world’s first helium-filled hard drive, HGST Ultrastar He6 is also the first hard drive in the industry to o er a 14-terabyte capacity. This design provides a 50% capacity gain and still reduces the energy needed to run the drive by up to 23%.
Key Advantages/Highlights

•   World’s first helium-filled hard drive
•   Industry-first 12TB capacity in a standard
•   3.5-inch form factor
•   HelioSeal® process and 7StacTM design are keys to hermetically sealed drive with higher capacity
•   TCOptimized design delivers on key elements of data center TCO: capacity, power, cooling and storage density
•   SAS & SATA 6Gb/s models for configuration flexibility
•   Self-Encrypting Drive (SED) options for HDD-level data security