Réciproque is Paris's largest and most exclusive swap shop. Savings on designer wear -- Hermès, Dior, Chanel, and Louis Vuitton -- are significant, but prices are not as cheap as you might expect, and there's not much in the way of service or space. The shop at No. 89 specializes in leather goods. The store is closed Sunday and Monday. Métro: Rue de la Pompe.