MacMall offers the refurbished LaCie 2Big 4TB Thunderbolt External Hard Drive, model no. 9000191, for $299.99 with free shipping ($0.07/GB). That's $60 under our July mention of a refurb and the lowest total price we could find for a new unit now by $269. It features data transfer rates of up to 327MB/s, dual Thunderbolt ports, dual cooling system, two hot-swappable disks, RAID support, and more.

Note: A 3-year warranty applies, although it's unclear who backs it.