I was recently contacted by David P. Chandler's daughter and son-in-law about displaying some of his items at Portland Retro Gaming Expo and helping them sell one of their Keyboard Components. They have three total. One they are never selling, one that functions correctly besides the tape drive and one that is displays a black screen (just like mine.) The extra functioning one will be in the auction at Portland Retro Gaming Expo, Saturday September 29th. They will have a table with a museum of his items on display.
http://papaintellivision.com/
http://retrogamingexpo.com/auction.php
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Thanks for looking!