Hi Bridge, I can only help with the cosmetics problem. Hong Kong is the best place to buy make-up of famous brand. Comparatively, clothes and watches are not that economical. Granville Road in Tsim Sha Tsui is a must go place. Visitors from other places usually like to go to SASA, while the Hong Kong local prefer to Bonjour Cosmetics Shop. Lung Shing Dispensary which apparently looks like a common drug stors is also a popular place to offer various kind of upscale make-up brands. You can also have a visit to Watsons and DFS (duty free). The best way is to list all you want and visit as many stores as possible to look for the cheapest. Good Luck!