Customers line in queue for shopping at a tax-free shop in Sanya, south China's Hainan Province, April 20, 2011. An offshore tax-free scheme for mainland shoppers is due to kick off on a trial basis across Hainan from April 20. The policy will prevent mainland visitors from paying various types of taxes on up to 5,000 (762 US dollars) worth of imported goods bought at selected duty-free stores on the tropical islands province in the south China. Only travelers who are 18 or older will avoid paying import duties, and the mainland visitors to Hainan can only buy goods duty free at the shop twice a year, while island residents can only once a year. Permission to buy goods duty-free in Hainan had been extended to foreign and non-mainland travelers before, but never to mainland visitors. [Xinhua/Guo Cheng]