This deal has ended.
Buy.com has the Fantom Titanium 320gb External Hard Drive for only $99.95 after a $20 mail-in rebate valid through 2/14. Plus, shipping is free and there is no sales tax (except CA, MA, MD, TN). This is $0.31 per gigabyte. Of note: the Fantom 500gb External Hard Drive is $150 ($0.30 per gigabyte) after a $20 rebate through 2/13.