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First-Class Mail International | USPS Send 1 oz letters or postcards around the world with one Global Forever ® stamp, which currently costs $1.40 and never expires, even if the postage price goes up. For large envelopes (flats) up to 15.994 oz, postage prices vary based on weight and destination. Buy International Stamps First-Class Mail International Prices Delivery times and service updates - Australia Post Estimate how long your delivery may take to arrive. Learn about service updates and current disruptions affecting inbound and outbound deliveries. International delivery times - Australia Post Estimate how long your international delivery may take. Find out which countries are currently accepting deliveries during COVID-19. Buy media mail postage online