SÃO PAULO, Brazil — Shoppers here with a notion of what items cost abroad need to brace themselves when buying a Samsung Galaxy S4 phone: the same model that costs $615 in the United States is nearly double that in Brazil. An even bigger shock awaits parents needing a crib: the cheapest one at Tok & Stok costs over $440, more than six times the price of a similarly made item at Ikea in the United States.