thats what we do with "birthday cards" and other fun mailings.. we put on a wide varity of stamps.. 1 cents, 2 cents, what ever.. so that the required postage is made up of a motley crew.. it started when i was i a child, grandparent's tried to interest us in stamp collecting.. and thought we would enjoy getting an assortment of stamps.. we did, even if we never started collecting them! US over seas postage is 60 cents.. some times i use 10 one-cent, 10 two-cent, a ten-cent, and a twenty-cent.. 22 stamps! if fills a large percentage of the envelope!