B&H Photo has the 4 Terabyte WD MyBook External USB 3.0 HDD on sale for $88.82 with free shipping.
As always, tax is collected in NY and NJ.
4TB Storage Capacity
USB 3.0 Interface
Includes AC Adapter
256-Bit AES Hardware Encryption
Includes WD Backup Software
Acronis True Image WD Edition Software
Windows & Mac Compatible
May Require Reformatting Before Use