At a quick glance, the next cheapest new I see from reliable retailers is about $160.
Amazon.com: WD Red Pro 3TB NAS Desktop Hard Disk Drive - Intellipower SATA 6 Gb/s 64MB Cache 3.5 Inch - WD3001FFSX: Computers & Accessories
Amazon.com: WD Red Pro 3TB NAS Desktop Hard Disk Drive - Intellipower SATA 6 Gb/s 64MB Cache 3.5 Inch - WD3001FFSX: Computers & Accessories