how much is it to send a letter
Using First-Class International Mail, a letter that weighs 1 ounce or less costs $1.15, a 2-ounce letter costs $1.72, a 3-ounce letter costs $2.29, and a 3.5-ounce letter costs $2.86. This assumes no special mailing service is required. A postcard to Mexico costs $1.15 in postage.