I did have a classifieds site on here, but I think Craigslist does it much better. You can find lots of local stuff in the Williamsport, PA and Elmira/Corning, NY Craigslist sites below:
Williamsport, PA: http://williamsport.craigslist.org/
Elmira/Corning, NY: http://elmira.craigslist.org/