Walmart offers the Memorex 640GB 2.5″ Portable External USB 2.0 Hard Drive, model no. 98428, for $70.84. Shipping adds 97 cents, or choose Site to Store pickup. Even with shipping, that’s $0.11/GB and the lowest total price we could find by $5. Sales tax is added where applicable. This 10.4-oz. unit contains a 2.5″ drive running at 5400 rpm with a 2MB cache.
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