Your zine will likely weigh one or two ounces. You can mail a one-ounce zine with a first class stamp, like a forever stamp, or the equivalent of 58¢. If the zine consists of more than four pieces of 8.5x11 paper, maybe play it safe and add a little more postage. An extra ounce is 20¢, or a total of 78¢.
Do you want your zine in the Barnard Zine Library? Email Jenna Freedman.