mwave has
HITACHI HDS721050CLA362 / 0F10381 Deskstar 7K1000 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive (Bare Drive) - 2 units for $78 + FS. They give $5 coupons for reviews so if you have a coupon or get one while the deal is still available you get them for $73.
Technical Information:
Configuration
# Quantity: 2
# Interface: SATA 3Gb/s
# Capacity: 500GB
# Max. areal Density: 352 Gbits/sq. in.
Performance
# Data Buffer: 16 MB
# Rotational Speed: 7200 RPM
# Media Transfer Rate: 1589 Mbits/s
# Interface Transfer Rate: 300 MB/s
Reliability
# Error rate (non-recoverable, bits read): 1 in 1014
# Load/unload cycles (at 40��,C): 300,000
Acoustics
# Idle: 2.4 Bels
Power
# Requirement: +5 VDC (+/-5%), +12 VDC (+10%/-8%)
# Startup current (max. A): 1.5 (+5V), 2.0 (+12V)
# Idle: 4.4W
Physical size
# z-height: 26.1mm
# Dimensions (width x depth, mm): 101.6 (+/-0.25) x 147
# Weight (typical, g, max.): 680
Environmental (operating)
# Ambient temperature: 0o to 60oC
# Relative humidity (non-condensing): 8% to 90%
# Vibration, random (G RMS 5 to 500 Hz): 0.67(XYZ)
Environmental (non-operating)
# Ambient temperature: -40o to 70oC
# Vibration, random (G RMS 2 to 200 Hz): 1.04 (XYZ)
# Relative humidity (non-condensing): 5% to 95%
# Shock (half-sine wave, G): 350
Tech Ignore/Unignore thread 2x Hitachi 500GB HDS721050CLA362 HDD $78 or $73 + FS 
