I have a Zeiss microscope head in great condition that can be converted into a binoviewer. I have a few contacts that can convert this microscope head with Televue parts into a fantastic binoviewer for a LOT less than other binoviewers. I originally was going to have it done, but I can't get images to merge comfortably on any binoviewer to date... so I'm giving up. This is top quality Zeiss manufacturing.
If interested, drop me a line for pictures and things.