I'm going to France in a couple of weeks and will be doing some major shopping there for the first time ever (i've been there 7 times before with no interest in major shopping, only passages and brocantes). It will be like a buying trip for me. Can someone please explain the detaxe for me. How much must you spend in one establishment to qualify? And how much money do you get back and when? The big stores I plan to buy at are Hermes, Goyard, Au Bon Marche and Didier Ludot. Thanks!