If you are handy you can make something similar to the blue cutter shown yourself. Take a 2x4 and drill holes through it close to the top that are barely larger than the diameter of the wire you want to strip. Take a screw and screw down from the perpendicular side (top side) so that the tip of the screw is just in the hole. Insert your wire, tighten the screw just until the screw tip cuts the sheath of the wire then pull it through. Same principal as the $100 ebay cutter. There are videos on youtube if my description isn't totally clear.