They're not in production and, as of last I heard, there's only one in existence that Francois Louis guards with his life. I'm reading a great book called "The Devil's Horn" by Michael Segell which is a history of the saxophone with a chapter on Francois Louis and the aulochrome. Evidently he's had problems with other companies blocking manufacturing with claims of copyright infringement which has interesting parallels to problems Adolphe Sax had.