A Bic lighter is a great source for flints. Take a dead, used, Bic or any other rip-off lighter like a Bic, remove the metal guard with a pair of needle-nosed plyers. You do not have to be neat.
Place your thumb on top of the igniter wheel and bend the plastic tabs holding the wheel to the side. Carefully release the preasure on the wheel and a flint, of the right diameter will fll into your hand. Sometims they are too long to fit into the Zippo, but a pair of side cutters will take care of that.
Sorry for the double post. Wal Mart sells Ronsinol lighter fluid at the check-out counter that has the ciggaretts.