Your best bet for Apple products is the Apple Store at IFC Mall in Central.
For other products, you can sometimes negotiate a good deal in one of the many other electronics places in Hong Kong.
Check out the Wanchai Computer Centre (on Wanchai Rd) and Mongkok Computer Centre (near the Ladies Market) for multiple floors of electronics bargains. Plenty of Samsung stuff in there and lots of accessories for your Apple products. about 6 years ago