JVC offers one, which is only a little bit wider, I think it's a .82x. Somewhere around $700.
The real wide-angle that you want is, of course, the 13x lens, with its 3.5mm widest end -- but at $11,995 retail, it's not exactly inexpensive.
I believe Century was trying to work up a wide converter for the stock 16x lens but was having some challenges because of the way the Fujinon is designed.