Walmart offers the Western Digital 1TB Caviar Green SATA 6Gb/s 3.5" Internal Hard Drive, model no. WD10EZRX, for $48.13. (Amazon charges the same.) Opt for in-store pickup to dodge the $4.97 shipping fee. (Otherwise, pad your order over $50 to bag free shipping.) That's $2 under our September mention and the lowest total price we could find by $3. It features a 64MB cache.