Us Postage Rates 2024 Per Ounce. For sending oversized mail between 200 grams and 300. Send 1 oz letters or postcards around the world with one global forever ® stamp, which currently costs $1.65 and never expires, even if the postage price goes up.
You can also use regular, domestic forever stamps as long as they add up to $1.55. For sending oversized mail between 200 grams and 300.