Seagate 500GB USB 2.0 FreeAgent Go Portable Hard Drive for $103.99 shipped after code C2$F7S4W96J$T1.  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 reference, Best Buy sells it for over $145.