For SURE the bags cost less in Europe and especially in France. You'll save about 150-200 by buying it at home. Once the goods leave the EU, there are all sorts of duties and tariffs that end up being built into the price.
I believe that the price in France, Germany and Italy equates to about $750USD for a City. So it's really not a good idea to buy outside of the Euro zone!
Well, when I asked a couple of the German/Austrian girls before my trip they quoted me 750 Euros for a City from the current collection...I didn't seek out Balenciaga in Europe but LV was definitely cheaper. So i am ready to be corrected if anyone has updated or different infoIt's more expensive in the UK than in the US too. An RH City costs £720, which is $1460 at the current exchange rate.
I'd love to know how much they are in France and Italy, though.