You have to be the stupidest motherfucker ever born. Are you actually asking if buying a used door from a junkyard would be cheaper than buying a brand new one?
How did you make it this far in life? Judging by your level of intellect, I would have thought there would have been a fork in a light socket or a game of dodgeball with a semi by now.
Kenny, before you decide on a different car, look around the net for reviews and common problem, so you know what to look for when you check the vehicle out.