'tai guei'!

I exchanged pms with tcl - mini iPhone (VIP model) can be had for rmb350-400 max. the iPhone with dual sim is older model and probably should cost even less (?)

Word of caution to all buyers - the software isn't even close to the real iPhone. If you want to make regular calls out and receive calls in, works like a charm. If you say return a call from someone that called you, it's like a 6 step process!

I didn't try any of the other applications except the camera (ma ma hu hu!).

In Shenzhen try:
4A-043B, 4/F
Hua Jiang North Rd

Actually the entire building is devoted to mobile phones.