Anon on 2/13/2012 11:55:25 AM:
As I recall, not many known rental outlets exist in Clinton if any. In addition, any one-way rental costs more because the rental company has to have the vehicle driven back to it starting point, usually from one its own outlets.
You might look into using Amtrak instead. You might have to backtrack or bike-ride to a train station depending on which direction you're going. But it's much cheaper! Good luck.