Refurb for Less via eBay offers the refurbished Hitachi Ultrastar A7K2000 2TB Serial ATA 3Gb/s 3.5" Internal Hard Drive, model no. HUA722020ALA331, for $32.99 with free shipping. That's tied with last May's refurb mention and the lowest price we could find for a refurb today by $5. It features a 32MB cache and runs at 7200 rpm.
Note: A 90-day warranty applies, although it's unclear who backs it.