If you don’t speak French, best to take someone along who does and who can haggle. Memorize the exchange rate and buy something that will fit in your suitcase. Mailing anything from France can be more expensive than your treasure.
How to get to the Paris Flea Market:
Porte de Clignancourt, line 4, coming from Paris.
Take the exit marked Boulevard Ornano, odd numbers, then the exit rue Belliaud /rue letord. Go under the ring road. Avenue Michelet is the continuation of the Porte de Clignancourt, but the easiest way to get to most of the markets is along the rue des Rosiers (first left off the avenue Michelet).
Garibaldi, line 13, from Saint-Ouen.
Reach the end of the rue des Rosiers by crossing the square Marmottan or along the rue Edgard Quinet .
N°85 (Gare du Luxembourg-Mairie de Saint-Ouen), Paul Bert stop (except Sundays and bank holidays, when the bus only goes as far as the Town Hall of the 18th arrondissement).
N°56 (Château de Vincennes-Porte de Clignancourt).
The PC: Porte de Clignancourt