Leonidas is made with proper chocolate and cocoa butter. The fact that it's made in industrial quantities doesn't stop it being good, especially compared with, say, Cadbury's! I have found some "artisanal" French chocolate that contains palm oil rather than cocoa butter and it's disgusting.
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Have you tried Google @Nollie? - https://www.pagesjaunes.fr/annuaire/perpignan-66/chocolateries-confiseries