Maybe I can help a little.
The connectors for the VEX robotics platform are no different than any regular remote control vehicle you buy for children. RadioShack has them (overpriced like everything there). I don't believe there are any specific OEM parts you can buy for them. The connectors are pretty universal and I have a couple laying around in my tool box.
7.2V version
9.6V version
The only difference between those is the wire gauge. You can slip the 9.6V one into the 7.2V one without any problems.
As for the PCB version, Mouser and Digikey are your best bets.
Sorry if I was no help, but it seemed like you may not have known that.