Amazon offers the Seagate FreeAgent GoFlex Desk V2 4TB USB 3.0 External Hard Drive, model no. STAC4000100, for $198.99 with free shipping ($0.05/GB). That's the lowest total price we could find by $8 and the cheapest 4TB USB 3.0 drive we've seen. It features pre-loaded backup software with encryption, capacity gauge display, 4-foot USB 3.0 cable, power supply, and more.