I found it recently online, we use it for wrapping cables before 'sewing' them into place on cable tray in Central Offices. I don't remember where I got it, but if you search around for waxed string, sewing cables, fish paper, something like that you'll find a source for the waxed string and sewing 'needles' used for telecommunications work.
Good luck! : > >>Does anybody know of a good source for "fish > paper" insulating material? > >>I trying to find it available in small quantities.