How to find where an AC power wire ends (or starts)?

If you happen to have a "toner/tracer" for one of those other wire types, and you are SURE the wire has no power applied (yes, you said that, but generically, one has to be careful when attaching things to power wires) you can simply try it. It may or may not work well enough to be of use.

You may be able to rent (purchase is unreasonable for someone not in the trade, IMHO) a more sensitive/powerful unit optimized for power cabling. Or you can purchase a more affordable but likely not all that capable unit which specifically claims to work on electrical power cables, but is likely otherwise similar to the network cable models.

Now, if you have a bare end (unpowered) and are trying to match other bare ends (unpowered) you can just use a multimeter - after verifying no voltage and no continuity between hot/neutral at each suspected cable, short one (hot to neutral) and look for continuity at the others, or attach a battery and look for the DC voltage at the others.

Yes, you can search for "wire tracer" or "tone tracer" and you will find examples of tools that you can hook to one end of a wire and help you trace it through walls and ceilings to the other end of it.

In my experience these work pretty well as long as there is not a lot of electrical noise nearby. If so, you may need to shut off the power to that area of the home in order to get good readings.