Chanel prices in PARIS, ROME and LONDON

hello, i would like to ask how much is the
Chanel Rectangle Quilted Wallet in Caviar in europe / england ?
buying chanel in which country of europe will be cheaper / more tax refund?
i am new to here, so thanks a lot!!:P
 
I want to purchase a Chanel J12 Automatic 38 in White with diamond markers. It's $6750 + tax in NYC. Does anyone know what the price is in Paris, London, Italy? Any boutique that is much lower in price? TIA