Sellers who have store shipping enabled can set free shipping for specific products. To set your product for free shipping, navigate to the Product Edit screen by clicking on Products, then Edit from your Dashboard.
Scroll down to the Shipping section and mark the “Override default shipping cost for this product” check box. This will display additional shipping costs that can be added or subtracted to the product shipping cost.
To set a product to ship for free, set the Additional Cost to negative (-) your default shipping cost. Example: If your default shipping cost is $7.99, enter “-7.99” into the Additional Cost field to set the total shipping cost to $0. All other fields should be left blank.
Hit the button to save your product.