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Shopping for the latest fashions is as essential a part of a St. Barths holiday as beach-hopping. Gustavia’s boutiques are an eye-popping, mind-boggling display, right on the harbor, rival New York’s Madison Avenue for upscale designer retail, including Dior, Louis Vuitton, Tod’s, and … more Bulgari. Gustavia’s Carré d’Or Plaza houses more top-notch galleries and shops, as do St-Jean’s La Savane Commercial Center and La Villa Créole. The entire island is duty-free.