MacMall offers the LaCie Rikiki 1TB Portable USB 3.0 External Hard Drive, model no. 301952, for $79.99 with free shipping. That's the lowest total price we could find by $10, although we saw a refurbished unit for $10 less over a year ago. It features data transfer rates of up to 5Gbps.
Before you send in your tax return, double-check that you haven't made one of these mistakes that can trigger IRS scrutiny.