Check out Aldi while stocks last. Oven Shelf guards look suitable for use as brake cable boots. £1.99 a length which can be cut to size and will make enough boots for about 4 or 5 cars.Simply slip over cable and superglue join. http://www.aldi.co.uk/uk/html/offers/special_buys3_15802.htm
Or VW gaiters (described as bellows) part number 311 713 269B. Peter Green gives a good description of how to fit them using a simply made wooden mandrel. John R