Carrefour market posted on their facebook page that they are offering 1 ‎€ = 1.25 US$. This is a great exchange, so anyone on island might want to go to an ATM and withdraw Euros as the bank rate is 1 ‎€ = 1.12 US$ and then use those Euros to shop at Carrefour. They did not say how long they are offering this exchange.