Best Buy via eBay offers the Western Digital Easystore 4TB USB 3.0 External Hard Drive in Black for $99.99 with free shipping. That's $5 under our mention from two weeks ago, $100 off list, and the lowest outright price we've seen. It features transfer rates up to 5 Gbps and also comes with a choice of $20 Shutterfly Credit or 8x8" Photo Book.