Western Digital Outlet discounts a selection of external hard drives. Shipping adds $7.99, or get free shipping on orders of $100 or more. (This applies to the "Regular Price", not the discounted "Promo Price".) Even with shipping, many are at or near the lowest total prices we could find. Some best bets, with prices after discount and free shipping unless otherwise noted:

• WD My Passport Elite 320GB 2.5" USB 2.0 HDD (pictured) for $59.99 + $8 s&h ($0.21/GB)
• WD My Book World Edition 1TB 3.5" USB 2.0 External HDD for $99.99 ($0.10/GB)
• WD My Book Elite 1.5TB 3.5" USB 2.0 External HDD for $114.99 ($0.08/GB)
• WD My Book 3.0 2TB 3.5" USB 3.0 External HDD for $129.99 ($0.06/GB)
• see all discounted external hard drives at Western Digital Outlet