Quilt shops in France are very few and far between and also very expensive. Count on paying between 18-26 Euros/metre for fabric, currently $24 - $34 a metre. Other "quilty" items are proportionately as expensive.
A few good ones in Paris, and there are others in the Bouche de Rhone or Mediterranean coastal cities - not much good for a Paris visit!
However here a few links to some in and very close to Paris.
http://www.lerouvray.com/
http://www.evrypatch.com/
following is approx 25kms south west of Paris
http://www.bestofquilting.fr/
south side of Paris
http://www.camomilleandco.com/index.html
I live in the south west so don't know the stores, but got the details from the website of French Quilting Guild.
Also general fabric stores often have a patchwork dedicated counter, such as this one just by La Rochelle
http://www.tissuschrisalie.com/presentation
Could be worth a visit, and they speak English too.
Here are some other fabric stores in La Rochelle
http://www.larochelle-info.com/laroc...s-tissus-.html
Enjoy your trip!