If you are referring to Packard or Metri-Pak sealed connectors, I have gotten them from either:
Del City in Milwaukee Wisconsin
WAYTEK INC Chanhassen, Minnesota
I have not been able to find anywhere that sells all the parts as a complete connector. You have to buy all the pieces individually (Male shell, female shell, male pin, female pin, cavity seals, and wire looms). Oh yea, there is a special crimper for the terminals. I use my standard crimper and then solder the terminals.
My last order was from Del City even though WAYTEK is across the city from me. Del City had better prices on the other stuff I needed (switches and preformed looms). I have been happy with the parts and prompt order shipment.
If you find a source for complete connectors let me know.