The Buffalo 1TB drive station USB external hard drive with full disk encryption (model no. HD-CX1.0TU2) is currently available at eCost.com in refurbished condition for $69.99, which is $60 off the list price of $129.99.  Even after the $14 standard shipping fee this is still the lowest price we've seen on this hard drive by about $21.  Sales tax applies for residents of California, Texas and Tennessee.

Also available at eCost.com is the refurb. Western Digital My Book Essential in both 1TB and 2TB capacities for $72.99 and $139 respectively.  Also priced at $72.99 at eCost.com is the Western Digital 500GB My Passport Essential Ultra-Portable External Hard Drive.  Amazon.com has the Seagate Expansion 1TB USB 2.0 desktop external hard drive for the reduced price of $89.99.