Expensive. Haikou Meilan Airport Duty Free Shop is China's first offshore island duty free shop at a domestic airport, approved by the Hainan Provincial Government and jointly operated by Hainan Duty Free and HNA Group. According to Dianping reviews, the coconut sugar at Meilan Duty Free Shop is much more expensive than outside. Coconut candy is made from coconut as the main raw material and is carefully processed using scientific technology. It retains the original flavor and nutritional content of coconut.