Re: CP3 power connector (12V)
EDIT: sorry, didn't read original post carefully enough. Looking for a female/socket for the CP3 side not the plug for power cable as below.
I believe (from previous postings on this group) that it's a 2.1mm x 5.5 mm barrel connector, center positive, and ideally the threaded variant.
Here's one I found. Sorry for UK link (I guess you're in the USA), but hope it helps you to find a supplier for you.