An update on the RC helicopter thread...
Having now done some extensive price comparison between hobby shops in and around Yau Ma Tei, the prices for RC helis in Shenzhen are drastically cheaper. Although I couldn't do an exact model-by-model comparison, the prices in HK seemed on average at least twice as expensive.
There are at least 3-4 RC shops near the Lo Wu train station with a lot to choose from. But since the shop owners speak little english, and thus would not be able to tell you if X model has collective pitch control for example, I suggest you do some reaserch online to know what features you want before heading up there. Once you know what you want, look at the actual heli and transmitter itself and ask to read the instruction manual. I'm quite happy with the one I got, (although I keep crashing....:-)