For its "M" Club members only, mwave.com offers the refurbished Seagate Momentus 5400.6 2.5" 500GB Serial ATA 3.0Gb/s Internal Notebook Hard Drive
, model no. ST9500325AS, for $49.99
with free shipping
($0.10/GB). ("M" Club membership is free; click the link on the product page to sign up.) That's $5 under our mention two weeks ago of a new one and the lowest total price we've seen. This 2.5" drive runs at 5400 rpm and has an 8MB cache.
A 180-day warranty applies, although it's unclear who backs it.