Printful Fulfilled Merchandise
Printful fulfilled items are subject to Printful’s return policy outlined at https://www.printful.com/policies/returns
To summarize, no returns or exchanges, except when the fault (misprint) of Printful.
Bookshop.org Fulfilled Books
Bookshop.org fulfilled items are subject to Bookshop.orgs return policy outlined at https://support.bookshop.org/en/support/solutions