Shipping upgrades allow sellers to offer a shipping option in addition to the regular shipping rate, and they are completely optional. A buyer can then choose the option in their shopping cart when checking out.
Adding shipping upgrades as a Buyer
After adding an item to your cart, click the Cart link at the top right of any page.
If the seller offers a shipping upgrade, you'll see a dropdown menu that says Standard Shipping to the right of your item. If you're purchasing using multi-shop checkout, make sure to check the shipping options for each seller.
If you don't see the dropdown menu, try contacting the seller to see if they can accommodate you. Learn how to contact a seller.