Cheap. Sun Moon Plaza in Dayingshan, Haikou is located on Guoxing Avenue in the center of Dayingshan New City, Haikou City, Hainan Province. The project covers an area of 160445 square meters, with a total investment of 3,997.63 million yuan, including environmental protection investment of10.37 million yuan. The most expensive duty-free shop in this area is Clarins Double Extraction, which costs more than 300 yuan. Because it is tax-free, it is cheap. Cdf Hainan Duty Free Official Mall is an online shopping mall for duty-free business of China Tourism Group China Zhongmian Co., Ltd., which was officially put into operation on February 1 2065438.