Fry's Electronics offers four Western Digital 3TB Red Internal Serial ATA 6Gb/s Hard Drives, model no. WDBMMA0030HNC-NRSN, for $399.96 with free shipping. That's the lowest total price we could find by $36, although they were $10 less last month. These drives are optimized for use in NAS systems and feature 64MB caches. Deal ends January 22.