I saw a Technodrome on eBay yesterday for a buy it now of $300. It isn't sealed in box, but it states being complete with box. I thought it might suffice what you're looking for. Here is the link.
http://www.ebay.com/itm/Vintage-Tenn...item2c6da10bb6
And no, this isn't my eBay page. Just trying to help.