Not to discourage trading or buying a plug from someone, but would you not be able to use a 4pin connector available at Radio Shack and make it yourself? probably run you about $6-$8 for the connectors, and most of us on KLOV Furoms have a ton of wires lying around. hopefully you have some long enough for your needs.
just a thought. it'd be quicker(and possibly cheaper) to do it yourself if the connector is available at 'The Shack'.