Northern France bookshops?

Well, in textkitian custom, I am going to inquire about bookshops in my destination of travel. I will be very close to Lille and Douai. Of course I will be in Paris, but that will be only for a short while. So which bookshops have a good ancient language section yo?

Here’s a scenario that I will dream in France: I haphazardly escape some random riot and then hide in this quaint bookshop. Then tucking myself in this corner, the “Dictionnaire étymologique de la langue grecque” by Boisacq falls off one of the bookshelf and then I haggle away with the owner ignoring the mayhem through the window and pay only one euro for it. Then I celebrate with chamomille tea and most people will ignore me when I yell “Vive la Republique!” every 5 minutes…