Umm... Well, I have about 20K games locally, and also know where to get all games from the former HOTU site, some rare adventures and shooters, some warez collections, DOS Collection, and have access to the bigger Russian old game preservation site (that is
www.old-games.ru).
But is it matters? Every such game must go thru "approved" procedure, so maybe it's easier to take something from this list, to shorten the selection?