Always running out of stamps? Buy stamps online and never run out again. Online you can purchase postage in a variety of ways. Whether you buy stamps straight from the United States Postal Service website, buy in bulk, or purchase printable stamps straight from your computer, you can get the stamps you need, exactly when you need them. If you are looking to buy stamps online or print your own postage for your mailing needs, check out these most frequently asked questions about online stamps. Avoid those insanely long post office lines once and for all!