Today only until 3 pm ET (or 100% claimed), Amazon offers the Seagate Expansion 250GB USB 2.0 Portable External Hard Drive, model no. ST902504EXA101-RK, for $29.99. (Click the right arrow until you find it.) With free shipping, that's $0.11/GB and the lowest total price we could find by $19. This drive runs at 5400 rpm.