Aside from visiting friends, what do you want to do while you're here?
Is there any hope of persuading your PA friends to drive to/from the nearest major PA city served by train and/or major bus line, in connection with picking you up from same? You could combine with some "city" activities (good restaurant, museum) and treat them, if you wanted to. Might not save money (or might, or could be a cost), but introduces a different possible set of activities with that group, if you are interested.