Never been there but there's Au vieux campeur in Marseille (www.auvieuxcampeur.fr/boutiques). Here's the topo: http://www.auvieuxcampeur.fr/cartotheque-librairie/les-topos-d-escalade-d-a... I assume they'll have it, otherwise maybe you can have it delivered to where you're staying. Alternatively you could try Decathlon but I wouldn't bet the farm on it, didn't find anything on their website.