Choose the Saint Ouen Flea Market is the world's largest flea market, located right in Paris. You will find 17 acres of shopping heaven with 2,500 dealers. Take the Metro (4 train) to Clignancourt to find the flea market. When you exit the Metro, make sure you walk past the initial booths and then turn left at the Rue de Rosiers.
Visit the Hippodrome de Longchamp, open only twice a year with 250 exhibitors.
Visit the flea market early for the best deals and the fewest crowds. Getting there as early as 5 a.m. to 6 a.m. isn't out of the question to score some fabulous antiques.
Get ready to get taxed in Paris. Ask retailers for a detaxe form to possibly get a refund on the whopping 18.6% tax you will pay in Paris. Present the form to the customs agent when you're leaving the country, and you can expect to see a refund in about six weeks.
Watch your pocketbook when visiting the open air markets. Pickpockets are common in these areas.
Stop in at the Louvre des Antiquaires (called the Louvre of Antique Dealers), located across the street from the Louvre Museum and the Ministry of Culture. You will find three floors of exceptional antiques for collectors or dealers.
Go to a public antiques auction at the famous Hotel Druout, located at the IXth arrondissement of Paris. With 16 auction rooms, there's bound to be something that you'll love.
Be aware that antique books in Paris can be pricey, but you can find valuable first editions of books at the bookstalls near the Seine River, known as les bouquinistes.