Time Out says
Less famous (and charming) than its older brother up north in St-Ouen, Montreuil’s flea market is where real folk rifle for antiques nowadays; mostly because it’s off the beaten tourist track so you can still get a bargain and find the occasional treasure. You’ll find pretty much everything, from vintage clothes and toys to old cutlery, 1940s light-fittings, furniture and antique glassware. Just be patient: you have to walk past stands selling arrays of junk before you get to the little square where the best dealers are (at the end of the alley alongside the periphérique). Haggling is par for the course bien-sur, so put on your best French accent and don’t give up until the price is right!