I enjoy shopping online because I don't like all the effort involved in shopping in a local store.  When I buy clothing I try to buy from the online version of a local store, that way if something doesn't fit I can return it to the store and not have to pay to send it back.

I buy a lot of things from Walmart.com.  I don't know if it is avaliable in China, but one of my Brazilian students tells me that he uses it with great success in Sao Paulo.  I have had good experiences with both Amazon and eBay.  I have never tried Alibaba, but I will someday!

I buy a lot of things online, and some of them from abroad (Japan, Germany, UK).  I am very careful about the businesses I deal with, but since I generally buy solid quality items, I don't run into the same problems people might encounter who want something as cheap as possible.  There isn't a lot of fraud in books, specialty clothing, and small niche markets.  Anything I might have to return I don't buy online at all, or I buy it online from within my own country, so the shipping cost won't bankrupt me.  I do buy through eBay as well, but I only deal with people who have a very high rating.  I've not yet been cheated.  The old adage: "If it sounds too good to be true, it is" is a useful notion to keep in mind.  If I want to gamble with an item, I do it at the local flea market where I can look the dealer in the eye.

Something to watch out for when buying from abroad are the exchange rates -- sometimes it pays to wait a while, or to do a lot of shopping all at once.  And I prefer to buy from smaller businesses instead of pouring more money into the greedy hands of Amazon.  It's not good for consumers in the long run if one company edges out everyone else.