Ending today, Newegg via eBay offers the Western Digital 4TB My Book USB 3.0 External Hard Drive, model no. WDBFJK0040HBK-NESN, for $109.99. Check out via PayPal and apply coupon code "C20FLASH" to drop the price to $89.99. With free shipping, that's tied with our expired mention from two days ago as the lowest total price we've seen for this drive in any condition. (It's the best deal we could find today by $39.) It features local and cloud backup and up to 5Gb/s data transfer speeds.

Note: This coupon can only be used one time per account.