ill highly recommend Agora Presse et Caetera which is situated on the corner of Rue des Archives and Rue Ste-Croix de la Bretonnerie in the Marais (4th). They have loads of rare publications and not just fashion magazines.
Also, theres La Libraire de la Mode on Rue Pierre-Lescot (1st) just north of Les Halles. It specializes in everything fashion and you can find trend forecast magazines and tons of runway mags. If you are interested in old seasons runway magazines you can get them here highly discounted. I got two GAP for SS07 today. They were originally 19.50euros each but now 5.00euros each. And because I said I was a student I got another 50 percent. You do the math B)
Good luck!
Also, theres La Libraire de la Mode on Rue Pierre-Lescot (1st) just north of Les Halles. It specializes in everything fashion and you can find trend forecast magazines and tons of runway mags. If you are interested in old seasons runway magazines you can get them here highly discounted. I got two GAP for SS07 today. They were originally 19.50euros each but now 5.00euros each. And because I said I was a student I got another 50 percent. You do the math B)
Good luck!