Ultimately, a substantial savings over the US price (which would of course be inflated by local, city or state taxes, where applicable): Let's say you're shopping in New York City, where sales tax is 8.875%. Your final price:R$4790.50. In France, you'd payR$4124.12, meaning you'd save 14%!
I find the prices in Paris to be cheaper than in the US and UK. Authentic French brands are cheaper in France, and many of the large department stores (Galeries Lafayette/Printemps/La Samaritaine/Au Bon Marche always seem to have specials.