I was able to pick up the Western Digital 320GB My Book External HD from my local Best Buy for $65. This was in a Florida store. The green box also checked out at $63 at a PA store, so this may be more than a few stores.
Western Digital My Book Essential WDG1U3200N 320GB 7200 RPM 8MB Cache USB 2.0 External Hard Drive - Retail
They are the black boxes with the Green Lids. It's the previous version of WD's My Book.
Newegg has the same version HD for $107.00 (out of stock 1/5/08)
WD 320GB Mybook <== Newegg link
Western Digital My Book Essential WDG1U3200N 320GB 7200 RPM 8MB Cache USB 2.0 External Hard Drive - Retail
They are the black boxes with the Green Lids. It's the previous version of WD's My Book.
Newegg has the same version HD for $107.00 (out of stock 1/5/08)
WD 320GB Mybook <== Newegg link