RefurbforLess via eBay offers the refurbished Hitachi Ultrastar A7K2000 2TB Serial ATA 3Gb/s 3.5" Internal Hard Drive for $29.99 with free shipping. That's tied with our August mention as the best price we've seen. (It's a current low for a refurb by $13.) It features a 32MB cache.

Note: A 90-day RefurbforLess warranty applies.