"As far as I know the only USDA inspection office that requires the additional postage as you mentioned, is at Hawthorne, California. This is not because of the USDA policy, but because the postmaster at Hawthorne is not allowing the shipments to be forwarded without extra funds" Unfortunately, Miami post office interpreted the rules the same way. I had to pay for extra postage from FL to NC and no amount of argument changed their position. This has led me to re-think getting seeds from SRGC and AGS in future years. Ruth