http://www.landwatch.com/Tioga-County-Pennsylvania-Land-for-...
Not individual .25 acre lots, but a committed developer can probably get it rezoned however they need.
It rises rapidly the closer in towards major cities.
If you're a large scale developer (of the sort that the county would hit up to help with transit development), you're probably going to buy a few hundred to a few thousand undeveloped/agricultural acres and get it rezoned.
This is a little better, $500/.25 acre and only slightly further than an hour from Pittsburgh. That's commuting distance for many people.
http://www.landwatch.com/Somerset/Cambria-County-Pennsylvani...
And here's some just an hour outside of Philly at $825/.25 acre.
http://www.landwatch.com/Montour-County-Pennsylvania-Land-fo...