Walmart.com has WD 4TB My Passport Portable Hard Drive on sale for $95.99 with free 2-day shipping or free in-store pickup. Black color only. USB 3.0 portable drive; no AC adapter required.
https://www.walmart.com/ip/WD-4TB…/190528556
Regular price for this model is $110 at NewEgg , Best Buy , Amazon , and B&H