A pack of Tri-X (5x120) is 17 Euros without tax. It would be little more expensive than US but you save lot of space and weight.
You can go on Prophot website (www.prophot.fr), you will be able to check out, film and chemical. They are in the 9eme Arr on rue condorcet. On the same street you have 2 other places, one is dedicated for renting (maybe the tripod).