Best Buy offers the OEM Western Digital 1TB WD Caviar Blue SATA 6Gb/s Internal Hard Drive, model no. WD10EZEX, for $39.99 with free shipping. That's $8 under our mention from four days ago and tied as the lowest total price we've seen. (It's a current price low by $15.) This 7200 rpm hard drive features a 64MB cache.