@chrislhk there is generally no such thing as a "high quality" breeder in Hong Kong. The SPCA has worked to change some laws recently which ban "hobby breeders" so that the industry can now be more regulated. Breeders are required now to have a license and must display it in their shop. Breeders have some bad reputations here of keeping animals in poor condition and throwing them out when they're no longer of use, like when they get sick or are too old. As such, you are gambling with your money if you buy a dog because you can't be sure of its health and condition. Meanwhile there are over a thousand dogs put down each year in Hong Kong due to a shortage of homes. Public housing does not allow dogs.
There are quite a few purebred dogs that get dumped at the shelters, so like others suggest, please keep an eye there and what you're looking for will with time probably come up! There are also lots of very cute mutts.
Hong Kong Dog Rescue can be a little tricky for someone not familiar with shelters, so you may find an organization like the SPCA a little easier to deal with as they are more corporate and less personal. Like Rani said, fostering is a good way to start because you're not yet committed, and with the SPCA you after fostering you get first priority for adopting.
One huge advantage of adopting through the charities is that they have taken the time to give the animal a thorough vet check and observation and know the personality, so they can help you get a better match and ensure a healthy dog!
If you have any trouble with dealing with the animal charities, let us know and I think a few of the posters here can give you some tips.
There's some really cute puppies at the SPCA right now: