This deal has ended.
Buy.com has the 320GB Western Digital "My Passport" External Hard Drive priced at $139.99 ($30 less than our previous posting). Shipping is free and there is no sales tax (except CA, MA, MD, TN). This model is compatible with either PC or Mac and substantially smaller than other drives with this capacity (it's just a bit bigger than an iPod). Plus, new Google Checkout users can get an additional $10 discount for signing up.