Welcome to the forum Dan, you just missed a button Eolina on EBay a few weeks ago that looked in great condition. As you know both the Vibrandoneon and Eolina are both not in production anymore. Ballone Burini has the new Vibrandoneon button and piano supposedly to be released. I have been waiting for about 1 1/2 years now. I am not sure if you have see their website.
I am personally interested in the 37 note plastic version.
I recently placed an AD for an Ballone Burini Eolina 45P and someone contacted me last week. Well I now own an Eolina. Place an AD and see if someone contacts you.
Monsters of Melodica