I phoned a friend. The friend was google and FAQs. Google and the FAQs guided me to the appropriate place to figure out additional shipping profiles. The USPS helped me with pricing for shipping.
So drop cards will be a thing.
Currently, there are drop cards for witch & wolf, mag rom com world, royal states, and bernadette franklin.
Leave a comment if you would be interested in a drop card for Vigilante Magical Librarians or the Fox Witch World books (x2 books per card, books will be $4.99 ea plus the like 1.50 to make the actual card.) Will have artwork from the series on it. (Eh, have to pay for that part but ehhh, it’s fine.)
Anyway… apparently, I was able to figure it out now that I’m not feeling like complete garbage.