Amazon offers the Hitachi Deskstar 5K3000 2TB Serial ATA 6Gb/s Internal Hard Drive, model no. 0F12117, for $69.99 with free shipping ($0.03/GB). Outside of the price below, that's the lowest total price we could find by $15, although we saw it for $10 less last week (since expired). It features a 32MB cache.

Of note, newegg has it for $79.99 before this $10 mail-in rebate, $69.99 after. Free shipping applies. Rebate ends June 16.