Foire Nationale à la Brocante et aux Jambons is a huge flea market which takes place twice a year in Chatou in the Paris suburb. I went there yesterday, and will hopefully return Sunday. The last day is usually a good day to go there if you want to negotiate and make a bargain. In particular, I keep my eyes open for old chairs, wine glasses, pictures and drawings. There is a lot of it but I didn't find the right ones - yet.