Western Digital 6TB SATA 6Gbps Hard Drive for $220 + free shipping
B&H Photo Video offers the Western Digital Green 6TB 3.5" Everyday Serial ATA 6Gb/s Internal Hard Drive, model no. WDBH2D0060HNC-NRSN, for $219.99 with free shipping. That's the lowest total price we could find by $30. It features a 64MB cache.
4 very similar deals were also reported by some other sources: