Have you tried two paws trading here in Nanaimo ? He's usually at the Island gun shows, there's one here in Nanaimo on Feb 17th, or call him at home, I have his # if you need it. You could also try Marilyn Crandall in Moscow Idaho, ( I have her email addy if you need it)
There is Dr in the States that knaps his own flints, sells them for less than the English ones, white in colour , spark way better also. Can't remember his name,maybe mooncoon can remeber ? he post on some of the US forums.
Cheers nessy