1" disc fork

I have acquired an aluminium Coppi frame on the cheap that I would like to use as a commuting bike. At the moment it does not have disc brakes fitted, but I have the means to make a carrier for the rear disc, the front end is another matter. I am struggling to find a 1" steerer fork. If I cannot find a compatible fork I have a cunning plan B and C, but does anyone know where I can get a 1" disc fork? Not too bothered about the material it is made from.
 
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