Out of the country cost me 2.20, Canada 1.10 and US .65 or .66 whatever it is. I can tell you that when your envelope came there was postage due of .20. I've had to pay it on every one that was sent with a .46 cent stamp. Not bitching, just saying a regular stamp will not mail these envelopes. They still get air in them and then puff up and won't go through their little slot.