In a news release on the Pennsic Independent website, Heirusalem writes:
The size and weight of PI disqualifies it from First Class mail. The only other option available to us is Priority Mail. This is only available to US subscribers. The cost of this option will be $20. The advantage is that we can guarantee delivery of your PI set with this option.
For more information, or to place an order, visit the Independent's website by clicking on "original article" below.