If you can get actual FRENCH fabric you'll be spending about 35 Euro and up ($50) a meter. Unfortunately, most of the fabric I've encounter has been American. With the tax rates for importing fabric the price tends to run around 18 Euro a meter for the American stuff (Moda, Kaufman, etc). The exchange rate today was $1=0.67 Euro. I'm a manager at a quilt shop in Germany...I order the fabric for the store and I'm consistently sticker shocked at the fabric in the local shops.
But I hope you really enjoy your trip. Paris is GORGEOUS and you are going to have an AMAZING time. :) And in case you find some phenomenal French toile... it usually helps me to remember that...a meter is about 4 inches bigger that a yard!- Good Luck!