Today only, PC Connection Express offers the Buffalo MiniStation Stealth 500GB USB 2.0 Portable External Hard Drive in Black, model no. HD-PCT500U2/B, for $68.99 with free shipping. At $0.14/GB, that's the lowest total price we could find for any 500GB USB 2.0 external hard drive by $11, although we saw this model for $19 less in September. This portable hard drive is Mac and Windows compatible.