From textiles to tomatoes, Turkey's largest city offers a wealth of bargains for keen shoppers. Istanbul is a shopper's paradise, with markets found in every corner of the city on every day of the week. There is truly something for everyone - even non-shoppers will enjoy sitting down with a cup of tea and watching locals and tourists sift through the piles of antiques, leather goods, brassware and produce. We give you the lowdown of the 10 very best markets.