Western Digital My Passport Essential 320GB Portable Hard Drive for $79.98. Get a $25 off $75 coupon here. Get a $25 off $75 coupon here or here. Be sure to pick one that has instant e-mail delivery. Withe the coupon applied, the total comes to $54.98 shipped. This 320GB portable USB hard drive does not require a separate power supply like most external hard drives and is also smaller than most of them, making it much more convenient to carry around. As a comparison, Best Buy has it on sale for $116.