Brocante at 2 rue Eugène Spuller by Square du Temple, (Temple Métro)
If your timing is lucky, twice a year approximately mid to end of May (start looking from mid-May, this year it is 29 - 31 May), and near the beginning of December, the Comité des Fêtes organizes a huge fleamarket which spills onto the surrounding streets Eugene Spuller, de Bretagne, Perrée, Debelleyme and Dupetit-Thouars, Place Turenne, Carreau du Temple and the Cour de la Mairie in the 3rd. Arr. It is like a smaller Clignancourt and other flea markets before they became too well known. It runs Friday morning until Sunday night and is where you can find everything and amazing vintage; trinkets, clothing, furniture, toys and treasures starting from one euro. A tip is to be the first to buy something in the morning, the vendor will usually accept any reasonable offer as it is a good omen for the rest of the day. The other brilliant thing is to be there near the close as after 7pm as you can get things that are left for free - it helps to speak French! The atmosphere is good and generally the people are very nice, as it seems this is a one off for them and they are doing it for fun. The Christmas Brocante is perfect for getting one of a kind gifts.
Also as an additional tip to NookandSpoon's for Free 'P' Star: look in the low bin along the wall to the right under the hanging clothes, you can find amazing things, all priced at three euros. I got a spectacular 70's dress the last time.
Brocante at 2 rue Eugène Spuller by Square du Temple, (Temple Métro)
If you go quickly you'll see nothing, if you take a little time you will find treasures - the most interesting are inside le marché du Carreau du Temple: I have found amazing clothes (sold by trendy and handsome young people working in fashion who have too much stuff!) , and a lovely handbag in black leather, almost for nothing and much more chic than you can find in any upscale shops. The range is from that to old collectable Kung Fu original movie theatre posters for 10 euros. It changes from year to year.
Is this your business?