Adorama via eBay offers the OEM Western Digital Caviar Green 3TB Serial ATA 6Gb/s 3.5" Internal Hard Drive, model no. WD30EZRX, for $89.99 with free shipping. That's $20 below our May mention and the lowest total price we've seen. (It's a current low by $13 and a penny less than the best price we could find for a refurb.) This drive is purportedly cooler, quieter, and consumes up to 40% less energy than standard mechanical drives. It features a 64MB cache.
From shoes to cookware, if you're willing to pay a little more for these awesome products, you may never have to shop for another again.