The cost of shipping on Etsy depends on several factors, including the size and weight of the item, the destination, and the shipping carrier. As a seller, you can choose to offer free shipping, set a flat shipping rate, or charge a calculated shipping cost based on the buyer's location and the item's dimensions. You can also choose to use Etsy's shipping labels to purchase and print postage directly from the site, which can offer discounted rates from major carriers like USPS and FedEx. To determine the specific shipping costs for your shop in Hong Kong, you will need to consider these factors and adjust your shipping settings accordingly.