Hi Steve,
Nathan Rd is an interesting place....but
Caution is the key word, particularly when you see all those camera bodies and lenses in shrink wrap....
Stanley St is always worth a walk too.
Know Wing Shing & Man Shing well, and its a bit of luck as to what they want to get rid of with price.
The Wan Chai Computer centre is also a place I will be calling at, have seen Pentax Ltd's in there before at reasonable money.
By all reports the price diffence between there and here is not all that great, at the moment, so it still makes the Adorama / B&H thing a viable option.