I can get it done for you in about two hours, using odds'n'ends I've got in my van. The cost should be nominal, say 30 quid for my time. Tell you what, I can do it next Sunday if you like.
I don't believe in modern plastics and machine-made wire, they have all the wrong vibrations and completely destroy the feng shui. The best natural cable is made from organically mined copper, hand-drawn through dies of meteoritic iron, wound with birchbark gathered by a full moon and glued with tree sap from trees you planted yourself.