ActionRobo in Yau Ma Tei (although they are moving and I'm not sure when as I'm not mobile enough to head out there at the moment) generally have all the name brand KO/fake 3P stuff and take pre-orders (but often sell out). There are also a couple of stores in In's Point (also Yau Ma Tei right next to the MTR). For a whole street of KO ranging from the absolute worst to some of the oversized higher end figures then head to Fuk Wing street in Sham Shui Po. Take the MTR and take the exit for the Golden Computer Centre. I don't know about specific figures sorry as I only collect licensed stuff myself... I just happen to take a lot of friends and the odd collector to these places when they ask. My one piece of advice would be to shop around first to find the best price unless you know something is super rare or a one off. Odds are you will find it cheaper than the first shop you find stuff in and if you don't you can always go back. Enjoy your hunt!