i always buy in the airport
i just bought last week
maybe it is the most updated info.
as long as u have a passport with u,u can apply vip card @ information counter,and enjoy 10% off from the duty free shop
the discount range can be 60% off to 30% off
depends on the products
for example,the cleansig oil, the price @ the airport is 19 usd...after discounted only 16usd...but hk price is almost like 300 hkd?