Tu lui envoies un petit message du genre:
"Hi! I am very interested in this item but I noticed that you only ship in The US. I live in France. Would you mind shipping to France? I can pay with PayPal and I am aware that the shipping costs will be higher. Please let me know if you change your mind. Thanks and have a nice day!"
Je ne sais pas si tu sais payer avec PayPal mais bon en général quand tu sais, autant l'ajouter. Souvent les vendeurs changent d'avis.