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Adrian keeps up a cool google maps page for GJ sites in Paris. Has quite a few music stores!http://maps.google.com/maps/ms?ie=UTF&m ... ee5259dd91
I see he has R&F Charles, however I don't see Castelluccia. We collaborate and make Adrian's page here the go-to place for things GJ in Paris.
Had a quick couple of days in Paris last week so had to check out the usual guitar shops, but while some (Casanova the ex-RF Charles shop) were closed those I could check over at Pigalle did not have much of interest in GJ guitars.
Apart from an Altamira 'Chorus' style at about regular retail price I could not find much else. Casanova probably had the usual gems in stock but the window display had a fancy Hofner Galaxy, a Framus and a Tele'
while the others mostly seem to want to sell vintage Fenders at inflated prices. I did enquire about a cute Di Mauro mandolin at one shop but 600Euros seemd a bit much, the last one I bought was less than 200.