This deal has ended.
Buy.com has the 1TB Cavalry External Hard Drive (model CAUM3701T0) on sale for $159.99. Plus, delivery is free and there is no sales tax (except CA, MA, MD, TN). 1TB (terabyte) is the equivalent of 1000GB, which is about 5 to 10 times the storage most standard computers have. And, this features one-touch backup.