Hello Michael,
You can add the NEC D2246 to your list.
In September 2017, there were new ones for sale on Ebay (more than 15 pcs)
I bought a few but sorry, I'm keeping them.
The carrier damaged them, I don't know if they still work.
The user milbourne on eevblog bought one, he may not be using it.
He's located in UK
Regards,
Marc
--
The 68K Documentation
http://marc.retronik.fr/motorola/68K