In attempting to find a replacement for my CPS connector, Toyota was no help. Two separate locations wanted me to order an entire engine wiring harness to get any connectors.
I still haven't replaced the connector, but after quite some looking around at the local junkyard, I found a couple reasonably suitable replacements. Four-wire connectors seem to be reasonably difficult to find, because they are basically nonexistent on older American vehicles that litter many junkyards. I came across more 8-wire weatherproof connectors than 4-wire (sure they'll work, but a very unclean solution).