Newegg has the Toshiba HDTB107XK3AA Canvio Basics 3.0 750GB USB 3.0 Black Portable Hard Drive for $70 - $10 off with coupon code EMCJJNA45
[Exp 11/11] = $60
with free shipping. USB 3.0 powered drive features a 12ms avg seek time, 8MB cache, 5400 RPM, and weighs 0.33 lbs. Good newegg reviews.