Western Digital Elements 320GB 2.5″ USB Portable Hard Drive for $53.99 shipped after coupon code HJZT256$XXP$TH. Here is a screenshot for your reference. This 2.5″ portable drive does not require a separate power supply and is also smaller, making it much more convenient. If asked during checkout, simply use your name as the business name. Most places have it for about $71 or more.