Print provider’s flat shipping rates for each item are pushed to your eBay store when it's connected with your Printify account.
See all Printify’s Print Providers’ flat shipping rates here.
There is an added option to display ‘Free Shipping’ for a product on your eBay account.
IMPORTANT: When using this option, you still need to pay the print provider shipping fees based on the flat rates mentioned above. However, free shipping can greatly increase potential sales in your store - consider adding the flat rate amount to your product retail price.