It should be around $1.15 (1oz. or less). If you are mailing a deposit the place you are mailing to should know the exact amount. Not sure about now as it has been 5 years since I mailed anything to the island but the postage (stamps) used to have to have a denomination on them. The "forever" stamps may not work so you probably should go into a post office to make sure it is done properly. Give it 2 weeks to arrive.