I’m going to Paris in a month with my close friend and she also suggested I wait to buy all my Hermes pieces till I’m in France. Even though I will save some money in France, I value my relationship with my SA and know she will help me get my Birkin very soon so I still purchase at my home store. I think one or two pieces in France isn’t a big deal if you do not have an established relationship. It also depends on how soon you want your Kelly — if you want it in the next year or so then I’d work on finding an SA you click with and purchase with them at Short Hills, if you are thinking 3-5 years then spend in France!
Enjoy your trip, South of France is lovely