Gamefly is pretty good about this:
GameFly: Star Ocean: The Last Hope PlayStation 3 Video Game | Buy Star Ocean: The Last Hope for PlayStation 3 | Rent Star Ocean: The Last Hope
Fair warning: I bought this game for 360 and it will probably go down as my biggest disappointment of the generation. I really, really disliked this game.
Rent it first or you might very well regret it.