Living in France myself and Clairefontaine (and Rhodia, as they belong to the same group which may explain why the paper feel kinda comparable) being French companies, it's quite easy to find them absolutely ... everywhere (be it in a supermarket, an office supply store (fancy or vanilla stationary), even your local 'épicerie' will often sell some pack of looseleaf as well as notebooks in various sizes), at a price affordable enough for kids to use in school.
BTW, it is also my go to paper ;)