I'd recommend spending a little more and buying the Seagate Backup Plus Slim 2TB Portable External Hard Drive (currently $99,but it is a 5400 rpm drive) and just removing the HDD from then enclosure. It's really simple.
I'm right there with you, I'd just feel dirty making money off of something that goes towards charity. That's why i just give away the ones i already own, but hey to each their own...