This Western Digital 4TB My Book Essential Desktop Hard Drive drops from $199.99 to $169.99 with free shipping at B&H Photo. This is the best price we could find for this external hard drive by $20. The average price for 1TB of storage is around $80 and with this USB 3.0, plug and play hard drive, you get 4, saving you roughly $150. Plus, this hard drive has received an average rating of 4.5 out of 5 from 45 B&H Photo reviewers. There is no sales tax (except in NY).