Hi,
well you're right when you say that there really 
is a problem with them: it seems that they don't 
really want to sell those cels !! But a friend of 
mine told me that she had been there, and they 
did have the cels in their shop. I managed to get 
those 4 Ken cels for this friend of mine after 
all... So if I were you I'd go there when I am in 
Paris. You have nothing to lose !!