Etretat Aire is now 8 euros & 2 euros for the borne payable at the machine, would not take my cc but accepts coins.
You are not allowed to use the municipal site facilities adjacent.
However the municipal site adjacent was only 12 euros per night in June with access to all facilities, nice grass pitch on the site, packed like sardines on the aires.
The site were allowing those that had entered the aires barrier an upgrade via a supplied exit voucher to change to the site.