electronics in china are rather expensive, unless it's local brands
best places in asia for electronics are probably japan (lots of cool stuff and most gadgets get released there earlier) and HK (almost?) no sales tax there.
Lots of folks make HK holidays and bring back bags full of iPads, macbooks, PS3's...
The only really cheap stuff in China is rip offs. For a while you could get great netbooks which were a 1:1 copy of a real brand (acer, lenovo, etc) but with better specs for a cheaper price. In most malls here you have to haggle like on a turkish bazaar and if you're a foreigner the base price is already higher. If a Chinese accompanies you and you have time, you can haggle the price down to around EU levels.