Need AC plug for the Cam V3: Black

Where can I order the proprietary AC plug for the Cam V3: Black - does anyone have a link?

It’s not proprietary.
If you mean the adapter that plugs into a wall outlet - it’s nothing special at all. Almost any USB wall outlet adapter will do. Does need to be able to supply at least a half amp (although the Wyze one is 1 amp).
As for the cable, again it’s nothing special - other than it can’t be an overly large micro USB connector.
Thousands of each available on your favorite online retailer, or local store (Walmart has then at check out).