Save a Pot of Gold at the End of the Rainbow. Welcome to Niagara Duty Free. Located at the Rainbow Bridge in Niagara Falls, Ontario Canada right across the Street from Casino Niagara, Niagara Duty Free will take care of all your duty free needs. We offer fantastic savings on products including fragrences, beer and liquor, tobacco products, jewellery, fine china and crystal, and specialty foods. At Niagara Duty Free we are strongly committed to customer service, and our sales representatives would be more than happy to help you with any questions about the duty free process, and assist you in making your duty free shopping experience an exciting part of your holiday.