I think you would find that you are the outlier there, but its not worth arguing.
You're looking for a transmission that was only used for a few years in about three platforms. Even then it likely was not the popular option when ordering, and not something that is collector enough for people to be squirreling away. Your best chance at finding one is to do a nation wide search on the site I sugested and find someone willing to ship.
Sounds like you only need the bellhousing, not the entire transmission. From people going 4 speed to 5 speed in the past, I'm fairly certain that the TK4 and TK5 both used the same bellhousing for the same engine. I can't say if they used the same input shaft between the different engines. Might be worth the time to do a search for just bellhousings too.
You seem to be worried about scams. The site I listed is a national salvage yard database. Anyone signing up to list their inventory on there is a professional salvage yard.
You seem to know it all, so you do your thing. I'll try to avoid interjecting any help or suggestions in the future.