I have seen a bunch of good ones listed. Not sure if these have been covered.
I take press board. (the kind made from saw dust) and soak them in melted wax. Cut them up in squares, and keep them scattered about. Shave a little off, and it will light easily.
Hand sanitizer, will take a spark.
also, keep your old pieces of Never Dull. These take a spark as well.
Paul