Yes all of those reasons, but we can not tell you if it is because of Amazon coding or USPS pricing. USPS has set up certain places in the past that do not get “special pricing”. It use to be mainly in Hawaii, Alaska and remote areas. We are in TX where the zones are 3, 4, & 5 for us to ship to within TX. We have seen the commercial pricing when the places have not been all that rural and going to TX (across the state).
We have seen Click N Slip be 5cent less than Amazon and PayPal for zones 5, 6, & 7 (since the change on January 19, 2026 for USPS and February 19, 2026 for Amazon).
The next time we get one of the Amazon commercial pricing we will check Click N Ship to see if Click N Ship follows the same pattern.