Not a great deal. It's all that's available in 4TB of late. It's just a $20 off sale price.
WD - My Book 4TB External USB 3.0 Hard Drive - Black [bestbuy.com]
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Model: WDBBGB0040HBK-NESNSKU: 5605524
Rating 4.6 out of 5 stars with 869 responders with 25 Questions, 92 Answers
Store files securely with this 4TB Western Digital My Book hard drive. Its 5 Gbps data transfer rate enables fast copying of files, and its automatic backup software can be set to fit any schedule. This Western Digital My Book hard drive offers built-in 256-bit hardware encryption and optional password protection for peace of mind.