Our Wal-Marts here in northeastern PA all seem to have stopped carrying it. The Mopar Mo-090 filter that they sell is the equivalent to the FL-300 and it is another rebodied Purolator, although it is a bit more money than the Motorcraft was.
If you have the room, you should be able to use the longer Motorcraft FL-1A. That is what I now use on my Jeep 4.0 and they are only $3.00!
Andrew S.