The Harmony is a great manual pump. It has a small lever at the top that allows you to pump fast (to initiate let-down). Then you move down to the big lever to empty the breast.
Your WIC office might be able to provide you with a pump. That's an excellent suggestion.
Oh, and don't forget about the best cheap pump in the world--your hands! Hand expression is easy, efficient (when you learn how) and totally FREE! If you want some info on this, let us know.