I am pretty sure that you can still get them from Honda. Google Service Honda. They are a very good online parts store.
But, I agree that a search for a running motor would probably a better deal for you. Just make sure that the cam passages are not plugged up if the motor has been sitting!

Sometimes in life you're the dog, sometimes you're the tree. Life isn't fair and we're all assholes on some level or another. The best any of us can do is not leave our drinks unattended. image