Seagate 500GB USB 2.0 FreeAgent Go Portable Hard Drive for $99.99 shipped after code MPPHVDR$QH5ZD$.  Here is a screenshot for your reference.  If asked, simply use your name as the business name during checkout.  The FreeAgent Go Edition USB drive does not require a separate power supply like most external hard drives and is smaller than most of them, making it much more convenient to carry around.  As a comparison, Best Buy sells it for over $145.