I don't know if you're reading this, or have picked up that D3. If so, I was going to mention a camera market in Beijing that's fantastic. Has a ton of new and old equipment. You'll find anything from 35mm up to 8x10 cameras, film, and darkroom items.
It's directly north of the Wukesong metro station on line 1. Go north about 1/2 mile on the east side of the ring road and once you're across the canal it'll be immediately on the right side of the road; can't miss it with all the camera manufacturer's signs.
Anyway, I don't know where you are in China...but maybe this will help. If not, maybe someone else can use it! Good luck.