When I've been asked this question, I've told everyone to spend the money on a gym membership. Maybe I'm lucky here in Dallas....you throw a stick & you hit 5 gyms, but the amount of money you would spend on a GOOD machine, you can get into a relatively good gym membership...and you have MULTIPLE choices of equipment/weights/classes. And come January, there will be all sorts of price reductions, etc.
If you're not near a gym, chances are really great that you're in a less populated area...therefore, you probably could walk/run outside (i.e. treadmill). Maybe elliptical would be a nice change from using Nature's Treadmill...
Food For Thought.