MacMall has the refurbished LaCie 4TB USB 2Big Thunderbolt External Hard Drive, model no. 9000191, for $359.99 (569.99 if new) with Free Shipping for limited time.

With speeds up to three times faster than FireWire 800, LaCie 2big Thunderbolt Series also features RAID security, hot-swappable disks, and daisy chain convenience. Heavy data users can turbo charge their workflow with jaw-dropping speed improvements. And capacities up to 6TB on 7200rpm hard disks deliver the professional storage they demand. Improve your workflow. Get huge data storage. Ensure full data protection. It comes with a 3-year warranty.