For heavy or bulky items, eBay rate tables are an effective way to define shipping rules which vary by destination.
You can find the settings for eBay rate tables in the Shipping & Returns section of your Offer Details values for any individual product, although in most cases it is best to configure shipping settings in bulk using Bulk-edit Mode.
Enable Rate Tables on the Listings in Single Edit
Scroll down to Shipping & Return and look for the Domestic Rate Table field.
Click the drop-down field and select the Rate Table to be applied to the product.
NOTE: If there’s only 1 Rate eBay on eBay selecting Enabled will apply that Rate Table. If there are more than 1 Rate Tables on eBay, the Rate Tables will appear here as an option.
You can use Bulk-Edit by checking multiple products (or all based on a filter), then applying the setting in the Bulk-Edit header.
For further assistance, please reach out to marketplace-connect@shopify.com