This WD My Book 6TB External USB 3.0 Hard Drive drops from $299.99 to $179.99 using the code ESCEKFK46 at Newegg. Plus, the shipping is free. This is the lowest price we could find for this backup storage devices by $10. The My Book is USB 3.0 compatible, works with both Macs and PCs and has data transfer rates of up to 5Gbps using USB 3.0. There's no sales tax (except CA, IN, NJ, and TN).