Free shipping but with a handling fee

I would like to add free shipping to only a select category. The rest of the store will use regular shipping methods.

Now, free shipping box work well for this, but how can I add a handling fee for specific category only?


You could just bulk add to shipping to the products. But I think adding this would affect your sales. Telling customers it’s free, but then adding a handling fee would frustrate the customers. Maybe just roll it into the price of the items?