Amazon offers the WD Red 3 TB NAS Hard Drive: 3.5 Inch, SATA III, 64 MB Cache - WD30EFRX for $109.99$97.99 with free shipping.
Capacity: 3 TB
Rotational Speed (RPM): IntelliPower
Cache: 64 MB
Interface: SATA3
Data Transfer Rate: 6 Gb/s Buffer to Host (max); 145 MB/s Host to/from drive (typical)
Form Factor: 3.5 inch
Read/Write: 4.4 Watts
Standby: 0.6 Watt
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