The only things you might find cheaper in France are made in France good alcohols like good wines or champagne. That's all. For alcohol in general those who live near the Spanish border go to Spain where it's much cheaper.
People Also Ask
The stuff the locals drink (table wines, calvados, no-mark cognac, no-mark champagne) are cheap, especially if you can buy from the producer. Stuff you can buy everywhere (foreign beers like Heineken, Scotch or Bourbon whisky, big-brand champagne etc) are not cheap at all, a...
These include, for example, drugs, counterfeits, some plants and animals, or some hazardous materials for health. Other products may be transported but their entry is subject to a strict regulation (weapon, fruit and vegetables, etc). If you don't follow it, you risk penalties.