When you arrive buy a magazine called Revue du Son. The back of the mag has a kind of classifieds section organized by location (Paris, Lyon, etc.). Many shops advertise in this section and include details as to components they carry, as well as their location and telephone number.
Beware of a place called Magma. They advertise heavily and carry lost of equipment but are @$$#0!e$.
Beware of a place called Magma. They advertise heavily and carry lost of equipment but are @$$#0!e$.