I have lived in Hong Kong for 12 years. I can tell you that, without exception, it has been my experience that all vintage or LF camera gear is more expensive here than in the U.S., U.K., Europe or most other places. I find it cheaper to buy stuff from Badger, Roger White, KEH, eBay, etc. and pay the shipping, than to buy locally.
That said, the two main areas for photographers are Stanley Street in Central on Hong Kong Island (not much LF equipment, but some film for 4x5) and the Kimberley Road area in Kowloon (lots of vintage cameras and lenses, but IMHO way overpriced).
On Stanley Street, Photo Scientific has a good reputation:
Address: G/F., No. 6, Stanley Street, Central, Hong Kong
Contact: Mr K K Poon
Phone No.: (852) 2525 0550 / 2522 1903
Fax No.: (852) 2810 6917
Homepage:
www.yp.com.hk/photoscientific
Other homepage:
www.photoscientific.biz.com.hk
Email:
photopoon@netvigator.com
Business Hours: Monday - Saturday 9:00am - 7:00pm
Sundays & P.H. Closed
In Kowloon, try:
David Chan Company
Tel (852) 2723 3886
Fax (852) 2311 2025
Email
ToHang@netvigator.com
Address Shop 15, Champagne Court, 16 Kimberley Rd., (Next To Mirama Hotel) Kowloon, Hong Kong.
By the way, although I also own a Shen Hao bought directly from the factory in Shanghai, I know nothing about mainland photo shops other than I've heard there is a big camera shopping area in Guangzhou ( 2 hours by direct train from Kowloon). Pick up a photography magazine in Guangzhou and there would be address for the shopping area. You might also try the Ace Index for China (http://www.acecam.com/china.html). ...ou'll never run out.
Best wishes,
Craig