Amazon offers the Seagate Backup 1TB Slim Portable External USB 3.0 Hard Drive in Red, model no. STDR1000103, or Blue, model no. STDR1000102, for $54.99 with free shipping. That's the lowest total price we could find by $7, although we saw it for $5 less last month. This drive is compatible with Windows and Mac and features pre-loaded backup software.