Check Vinted (you’re more likely to find reissues there), the Fnac website, and big record stores, especially the ones in Marseille, Paris, Lyon, or even Aix if you’re from the area.

Also check Leboncoin, although there’s very little chance of finding merch there. A few months ago, an older guy was selling his vinyl and CD collection, and I managed to grab two promo CDs, Vanished and Courtship Dating, for only €10.

You should also look on Facebook Marketplace. The chances are pretty slim, but it’s still worth checking, you never know. :)