Original artwork in Paris

found a wonderful shop near Notre dame which sells original Bande Dessine pages http://www.danielmaghen.com
and then it got me thinking about other places that may sell original artwork:
http://www.bdartiste.com/dotclear2/index.php?category/De-crecy/Nicolas-de-Cr%C3%A9cy-S%C3%A9rigraphies

one of my favourites De-Crecy
Now to check if there are any galleries in London? a tad closer to home