TigerDirect offers the Buffalo MiniStation Stealth 500GB USB 2.0 Portable External Hard Drive in Black, model no. HD-PCT500U2/B, bundled with Total Defense Premium Internet Security Software for $84.99. These $10 and $60 mail-in rebates cut it to $14.99. With free shipping, that's $0.03/GB, $20 under our mention from June (which didn't include the software), and the lowest total price we've seen. (It's also a current low by $35.) This portable hard drive is Mac- and Windows-compatible. Deal ends November 24.

Note: Total Defense Premium Internet Security must be activated before the rebate can be redeemed, which involves providing your credit card information. However, you can cancel the service at any time within the first year without incurring any additional charges.