Great you found a good buy here, Renato. There are a few places tucked away where you can get good discounts on designer stuff, though probably more mainstream where a lot cam in at some point, and from what I can see some of the niche brands seem to be quite a bit cheaper here than States and possibly Oz - I'm guessing that's due to our 'duty free port' type status . . . no VAT or some of the other things they hit you with.
Any basenoters reading this who may be passing thru, please check out the HK section here which Coconut has put some time into, or feel free to PM ahead with your target buys and I'm happy to try and point you in the right direction.