Get a 500GB portable USB 3.0 hard drive for $79 - CNET
Seagate ST500LX012 500GB 2.5" SATA 5400RPM HDD Hard Drive
Amazon.com: Seagate BarraCuda Pro 500GB Internal Hard Drive Performance HDD – 2.5 Inch SATA 6Gb/s 7200 RPM 128MB Cache for Computer Desktop PC Laptop, Data Recovery (ST500LM034) : Electronics
Amazon.com: Seagate Expansion 500GB Portable External Hard Drive USB 3.0 (STBX500100) (Old Model) : Electronics
1D8ADL-500 Seagate External Hard Drive
Seagate 1DG142-540 - 500GB 5.4K RPM SATA 7mm 2.5" Hard Drive - CPU Medics
Amazon.com: Seagate Video 2.5 HDD Hard Drive - Internal (ST500VT000) : Electronics