Seagate Barracuda 7200 1 TB 7200RPM SATA 3Gb/s 32MB Cache 3.5 Inch Internal Hard Drive ST31000528AS Bare Drive
Price: $53.99
http://www.amazon.com/gp/product/B00272NHOK
Free ship and no tax for most

Product Features and Technical Details
Capacity: 1 TB
Interface: SATA 3Gb/s
Cache: 32MB
Spin Speed (RPM): 7200 RPM
Average latency: 4.16ms
Random read seek time: <8.5ms
Random write seek time: <9.5ms