We live in australia. My son is studying french at high school. i'm interested in getting cards from newer sets in french. any thoughts?

Other than France, I don't know? It's funny, because I would love to trade my French cards for English ones.

i'm more looking for a site in france that is reliable to buy simple stuff like intro decks or boosters

You can try http://www.magicbazar.fr/, but it's seriously overpriced.