RefurbforLess via eBay offers the refurbished Hitachi 3TB Ultrastar 7K4000 3.5" Internal Hard Drive, model no. HUS724030ALE641, for $58.99. Apply coupon code "C20SPRING" and check out via PayPal to drop it to $47.20. With free shipping, that's $16 under the lowest total price we could find for a refurb elsewhere. It features a 64MB cache and 7,200 RPM. Deal ends March 27.
Note: This coupon can only be used once per account. A 90-day warranty applies, but it's unclear who backs it.