Ebay via Newegg has the 2TB Seagate Backup Plus Slim USB 3.0 portable drive for $120 shipped. That’s $80 of the original listing, $24 better than Amazon’s current price, and matches the lowest we’ve seen this model go for. It features a metal design, backwards compatibility with USB 2.0, and works with both Mac and PC. One interesting option here is that you can take the 2.5-inch drive out of the case and upgrade your Macbook Pro or PS3, and potentially put the old MBP drive into the Seagate enclosure.
This model (STDR2000100) has received a 4.5/5 star rating on Amazon.
Seagate 2TB Backup Plus Slim USB 3.0 portable drive: $120 shipped (Reg. $200)