In-store only and with stock varying by ZIP code, Radio Shack offers the Western Digital 1TB My Passport 2.5" Portable USB 3.0 External Hard Drive, model no. WDBBEP0010BBK-NESN, for $48.98 ($0.05/GB). That's $10 under our mention from three weeks ago and the lowest total price we've seen. (It's also a current price low by $21.) It features password protection and hardware encryption.

Also in-store only and with stock varying by ZIP code is the Western Digital My Passport 500GB 2.5" Portable USB 3.0 External Hard Drive in Black, model no. WDBKXH5000ABK-NESN, for $34.98 ($0.07/GB). That's the lowest total price we could find by $25. (For further comparison we saw a refurb for $47 in July.) It features automatic, continuous backup and password protection.