At Le Val d'Authie in Villers-sur-Authie (Somme) camping costs as little as €18,- per night during low season with CampingCard ACSI. At one of the 50 touring pitches you will get a discounted rate during the period . At this campsite you can not only use your CampingCard ACSI for inexpensive camping, you can also use your ACSI Club ID (as an alternative ID).
This five-star campsite with excellent toilets and many facilities is 10 minutes from the coast, with Marquenterre nature reserve, and from the woods at Crécy. The site is an oasis of peace and has a good restaurant, indoor swimming pool and wellness room. Good cycling options.