Another unit just came up from the same seller. They're asking for $139.99 which is $10 less than the other unit.
This is one of the desirable 1985 Rev B units with the slush molded shell that was used for the on screen props. Note the one piece top shell with no back panel insert.
While the injection molded shell I currently have will meet my needs (and is stronger) I still wouldn't mind having the original source part. If nobody else here is bidding I may make a low-ball offer myself.
P.S. I wonder where they're finding these.