Newegg via eBay offers the Samsung D3 Station 4TB USB 3.0 Desktop External Hard Drive, model no. STSHX-D401TDB, for $99.99 with free shipping. That's tied with last month's mention and the best price we've seen for this hard drive. (It's a current low by $35.) It features SafetyKey data protection.
Adorama via eBay offers the Seagate 4TB Expansion USB 3.0 External Hard Drive, model no. STEB4000100, for an in-cart price of $99.99 with free shipping. That's the lowest total price we could find today by $20, although we saw it for $11 less via rebate two weeks ago.
Newegg via eBay offers the Western Digital Elements 1.5TB Ultra Portable USB 3.0 External Hard Drive, model no. WDBU6Y0015BBK-NESN, for $69.99 with free shipping. That's $10 below our mention from this past winter and the lowest total price we've seen. (It's a current low by $34.) It features USB 3.0 data transfer rates of up to 5 Gb/s and is backwards compatible with USB 2.0. Deal ends May 10.