These things often show up on the *bay. Try checking the german *bay, where they show up almost every week.
You definitely do need the shutter release cable and if you will shoot any flash, the sync cable. The shutter to back cable is nice but not neccessary for the shutter to work. (I have one that I will not sell, but what is worse, I cannot find it at the moment, as I forgot when I last used it. )