I hate to say this, but good luck. I have yet to ever see these available. A number of years ago I exchanged e-mails with a woman who had owned one some years before, but I don't have a clue as to who she is any longer or where she got it from.
You might try contacting some of the dealers who tend to get odd ball stuff in. Try Mike at Glades, Ben Siegal, perhaps Regal Reptiles, Coastal Reptiles, and Zoological Imports.