Be careful what you are buying too. I went to Beijing, Shanghai, Xian and Hong Kong earlier in the year. Even in "proper" looking shopping malls there are fakes - I had somebody try and sell me a "Canim 7d" and then went on to touching up my camera bag and trying to get me to tell them how much monies worth of lenses I own.
I didn't find it worthwhile buying out there (and sometimes the display price was noticeably more expensive that buying from our very own Kerso!) Cheapest place was Hong Kong, and I bought a couple of things from a shop I found had alot of recommendations on the internet for being a good place (not that will help you much!)