There are more products or options in Ebay when a customer is planning to buy a product which is an advantage as well as a disadvantage.
The disadvantage is when the customer is not able to filter to the product which is an exact match to his requirements.
For e.g. - When I filter using Price + Shipping Lowest - first, some of the products are free for shipping only for seller's city and others are free for delivery anywhere in India.
As the Buyer's in Ebay are all over the country the buyer's within the seller's city are going to be very less, so there is no point showing the shipping is free for whoever is filtering.
This makes filtering the products very difficult and user has to go into each and every product to see whether the product is free for selling in his city or not, which makes user experience worse.
I have developed a number of websites and I know a problem in user experience when I see one.
So try to add one more filter, free for the selected shipping PIN CODE anywhere applicable in your website, which is a more relevant filter than showing the products which are Free for shipping only for seller’s city