Le Crotoy is €93 a week. http://www.cnbs.fr.cr tel 0033322278311. I have not stayed there but it is the somme estuary. Saint-Valery-sur-Somme is €135 a week but I can vouch for the facilities and the town. http://www.portsaintvalery.com 0033322602480 telephone numbers include country codes Plus you have the sailing options of the estuary and the somme itself I believe you need the cervini but I doubt anybody will check.
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