IC Racer Foma produces both DS8 and Double 8mm the film the Bolex uses, the Eumig C3 uses the same film. the only DS8 camera I've mentioned was the Pathé. The link I've provided was to Wittner Cinetec and they sell both 8mm and DS(uper)8.
Ic-Racer is right though you can't use Double super 8 in a standard Bolex only Double-8mm. But be careful when buying the Bolex some were in fact converted to DS8. http://bolexguy.com/DoubleSuper8.html and http://www.duallcamera.com/store/ind...Super8mm.shtml