I sell a lot of baseball cards and recently eBay added support for a much cheaper shipping option, using a standard envelope but offering tracking for a much much cheaper price than normal First Class USPS mail. They call it eBay Standard Envelope:
It’s a brand new service, but one a LOT of sellers are really excited to use, and a lot of buyers are excited for since it’ll drop shipping charges by $3 or so. Note it only applies to trading cards (sport and non-sport).
Can you add this to the Shipping options?