newegg offers the refurbished Seagate 400GB Barracuda 400GB Serial ATA 3.5" Internal Hard Drive (pictured), model no. ST3400832A, for $27.99 with free shipping ($0.07/GB). That's $39 under the lowest total price we could find for a new unit. It runs at 7200 rpm and features an 8MB cache.

Of note, newegg also offers the refurbished Western Digital 160GB Serial ATA 3.5" Internal Hard Drive, model no. WD1600AABB, for $16.99 with free shipping ($0.11/GB). That's $13 off list and the lowest total price we could find. It runs at 7200 rpm and features a 2MB cache. Each drive includes a 90-day warranty, but it's unclear who backs it. Both deals end June 27.