Welcome to HK Outdoors!
I rarely camp, have little gear, so don’t know so much re the stores.
But one store I sometimes use – as has fair range of gear, plus an outlet that’s convenient for me (in Wanchai), is ProTrek.
Info on the company: [ul]http://www.protrek.com.hk/aboutus.htm[/ul]
Maybe others can suggest more shops; I’ve some memories of street in Mong Kok where there are several outdoors shops; quick google search, and seems this is Fa Yuen Street.
(I must go and check it out, add to Need to Know Basics).
Hope you find a good store, and report back to us.