As you may already know, rate calculations for USPS priority mail packages in the 1-5 pound range will be changing on June 30th. The new rates will be determined in part by the distance the shipment must travel. We are working diligently to put in place an improved process for calculating the shipping cost for packages based on the zip code of the buyer and seller. The upcoming improvements will be tightly integrated into the existing Post Sale Management checkout system, and should be available within the next week.