That's a socket 754 motherboard?
It's almost impossible to find one now unless someone somewhere may have one lying around.
Also, some may suggest buying a used one if you find one.
But i suggest you avoidthat as it may die on you just after you have bought it- happened to some people.
If your computer is really old and you do need to use one regularly, it's best if you buy yourself a new one.
Entry-level stuff is not very expensive imho and it will be way faster too.