For its "M" Club members only, mwave.com offers the Seagate Barracuda 7200.12 500GB Serial ATA 3Gb/s 3.5" Internal Hard Drive
, model no. ST3500418AS, for $36.99
with free shipping
. ("M" Club membership is free; click here
to join.) That's $0.07/GB and the lowest total price we've seen for this drive by a buck. (It's a current low by $4.) It runs at 7200 rpm and features a 16MB cache.