Newegg offers two Western Digital 3TB Red Serial ATA 6Gb/s 3.5" Internal Hard Drives, model no. WD30EFRX, for $194.99 with free shipping. That's tied with our May mention and the lowest total price we could find for the quantity today by $23. Designed specifically for small NAS systems that have one to eight drive bays, each drive features a 64MB cache and runs at 5400 rpm.