What does a European letter air mail postage stamp cost?

Answer 1

Do you mean from the US to Europe?
90 cents for a one ounce letter.
The following link is to the US Postal Service postage calculator:

http://ircalc.usps.gov/

Answer 2

I should have warned you, I assumed though you already knew brother. Food stamps are only in fact for mailing, food. Like when you wanna send some chicken soup to a sick friend, or a fuitcake or whatever to a realtive during the holidays. In those cases, are the only time you use food stamps as postage. My bad dude i forgot to tell you , yet again... fvck it,.