ME and XP computers. (Kountze)

LOL! Yes, I have two computers I don't think I have a need for any longer.
I have an eMachine ME computer.
I don't expect to get much for it, but I think it would be a good tool to teach young children how to use a computer from the beginning.
It is slow, for sure, but useful.
I haven't turned it on in several years.
The power supply may need addressing.
I have replaced that in the past.
I have a Compaq Presario with Windows XP in it.
It has a 200 GB hard drive and 4 GBs (I think) of RAM.
It is a little slow, too, but very functional.
This has been used more recently and is in good working order.
I'm curious to find out what they are worth in others eyes.
I have a value in mind.
Let me know what you think.