Your local junkyard should have one. They were used on a bunch of models, and they are very well built and hard to damage. So I would not feel too bad about getting a junker.
That said... I wonder how his failed, and what he did to make it fail. What is it doing, and has he done a postmortem yet?
It's actually not hard to repair these things.... it's not that hard just to pull the case open and do the work yourself. It's not like a typical modern automatic that needs to be sent to a specialist for a complete rebuild. On the other hand, junkyard replacements are cheap enough that you might want to save your time.
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