1. add-ons, not part of the package, additional
throw in additional extras
When something is an additional extra it usually signifies that it is part of a package deal or that something has been added to make a sale or purchase more attractive to the buyer: "This car comes complete with a full-service history and additional extras." "This outfit comes with shoes and a matching bag as additional extras." "The subscription comes with a sports and children's channel as additional extras." This expression is often used to advertise items that are associated with a product that comes as a set or that belong together.