Not to take away from anything you said, but in case someone didn't know, USPS offers shipping for "media" (dvd, books, cds, etc) which is often cheaper - https

Not to take away from anything you said, but in case someone didn't know, USPS offers shipping for "media" (dvd, books, cds, etc) which is often cheaper - https://faq.usps.com/s/article/What-is-Media-Mail-Book-Rate https://faq.usps.com/s/article/What-is-Media-Mail-Book-Rate