Seagate STCA3000101 Backup Plus 3TB USB 3.0 External Hard Drive for $95.99 shipped. Here is a screenshot for your reference. It uses SuperSpeed USB 3.0 port, which is backwards compatible with USB 2.0 for additional system compatibility. Most places have it for about $109 or more.
Originally posted earlier, this post has been revised and is just a friendly reminder.