Anyone have one they'd be interested in selling or know where to look?

Try searching on ebay too, And any vintage/antique shops.

And bring a wad of cash, the only one I've seen at auction sold for over $500 in an unknown condition (didn't look functional).. Try taking a picture to the antique stores and ask them to keep an eye out for one ( expect to pay a premium ) and that picture really is worth a thousand words because sometime they have no idea what your talking about, but once they see it in a picture, it can make a world of difference...