Seagate 2TB SATA 3/64mb cache HD: $70 offers the Seagate Barracuda LP 2TB Serial ATA 6Gbp/s 3.5″ Internal Hard Drive, model no. ST2000DL003, for $69.99. With free shipping, that’s $0.03/GB and the lowest total price we could find by $10. This low power/heat green drive runs at 5900 rpm and features a 64MB cache.  It is a newly updated version of this drive which updates the SATA interface and doubles the cache.