The price of an SEO campaign in Hong Kong depends mostly on your website current organic ranking, the nature of your industry and how competitive it is to rank at the top of Google. SEO services in HK can be considered a bit expensive, however the ROI that you will get outweighs your investment.
SEO agencies in HK use different rates and payment models for their services.
You can get SEO services from as HK$3,000 or as expensive as HK$25,000 per month.