Some interesting PROPOSED changes for the USPS. (not sure if and when they will be reviewed or take effect, see link below for more information)
International Reply Coupons
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Due to low quantity demand by customers, the Postal Service proposes to discontinue the sale of international reply coupons. The Postal Service will continue to exchange (redeem) international reply coupons purchased in foreign countries and presented at U.S. Post Office facilities.
Global Forever Stamp
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Building on the success of the domestic USPS ForeverĀ® stamp introduced in April, 2007, the Postal Service is proposing to introduce an international Global Forever stamp. Global Forever stamps can be used to mail a 1-ounce letter-size mailpiece anywhere in the world, regardless of when the stamp is purchased and regardless of how prices may change in the future.
More info here:
https://www.federalregister.gov/articles/2012/10/23/2012-25992/international-mailing-services-proposed-product-and-price-changes#h-13Regards, Al / NN4ZZ