Staples offers the Western Digital 1.5TB My Passport Portable USB 3.0 External Hard Drive (pictured), model no. WDBY8L0015BBK-NESN, for $79.99. Coupon code "76793" cuts it to $69.99. With free shipping, that's $0.05/GB, $10 under our mention from three days ago and the lowest total price we've ever seen for a 1.5TB USB 3.0 portable hard drive. (It's a current price low by $19.) It features a data transfer rate of up to 5Gbps. Deal ends September 14.

Update: For its newsletter subscribers only, newegg offers the Toshiba 1.5TB Canvio Basics Portable USB 3.0 External Hard Drive, model no. HDTB115XK3BA, for $89.99. Coupon code "EMCXLWT24" cuts it to $69.99. With free shipping, that's $10 under our July mention and a current price low by $14. It features an 8MB cache and runs at 5400 rpm. Coupon expires September 19.