This may have already been addressed, but there are a handful of Canadian Francophone online bookstores that have a decent selection of Tezuka material in French.
has a decent selection, but I recommend Archambault () and Renaud Bray , two of the largest bookstore chains in Quebec, which have a pretty good selection in stock on a regular basis.
But the best by far is Fichtre!, an independent Montreal store that may be the best source for Francophone comics in North America. They currently have 93 Tezuka titles in stock or available on order, including Ayako, Vampires, Dororo, Barbara, Black Jack, etc. Their website is and if you call them up on the phone they're very helpful, knowledgeable and bilingual. Their prices are good too.
I know a lot of Americans take French as a second language in high school, and although I'm a bilingual Canadian, I can tell you the level of language in these comics is not inaccessible to people with just a basic grasp on French.