Other 2009 price-change stamps , stamp cards and stamped envelopes are : a 28-cent polar bear stamp ; a 28-cent koi fish stamped card ; a 44-cent Purple Heart stamp honoring wounded U.S. veterans ; a 44-cent Seabiscuit stamped envelope ; a 78-cent Mary Woodard Lasker stamp ; a 44-cent U.S. flag stamp ; a 44-cent Celebrate ! stamp ; a 64-cent dolphin stamp ; a 98-cent Grand Teton National Park stamp ; a 79-cent Zion National Park stamp ; and a 44-cent Edward Hopper stamp .