This deal has ended.
Buy.com has the 1TB Fantom Drives G-Force External Hard Drive priced at $79.99 after this $20 mail-in rebate (through 6/30). Shipping is free, there is no sales tax (except CA, MA, MD, NY, TN), and new customers can use this $5 off $100 coupon if they spend $0.01 more. Under $0.10 per gigabyte is a great deal on external storage. Plus, it's compatible with either Mac or PC (USB and eSATA) and comes with a one-year warranty.