If you can't find any make your own. At least that is what I do. Take a spool of red and black and unspool them side by side. Tie them together at each end. Loop one end over something to hold it. Make a hook out of a piece of coat hanger and put it in a drill (I use a cordless). Now hook the wire to the hook you made and while pulling the wire tight turn the drill on and let it twist. The more twists you put in it the better. Just be sure to start with plenty of wire because the more you twist the shorter it will get.
Fair Winds and Following Seas
Bill H. PTC USN Ret
Chesapeake, Va