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1-3 Business Days. First-Class MailÂ® is a fast, affordable way to send envelopes and lightweight packages. Itâs perfect for business and personal correspondence, cards, brochures, and lightweight merchandise. The First-Class Mail ForeverÂ® Stamp price is $0.49; First-Class Mail Postcard Stamp price is $0.34.
The postage rate for mailing a regular first-class letter in the United States starting May 31, 2015 is $0.49 for the first ounce and $0.22 for additional ounces up to 3.5 ounces. After that, you must use the rate for large envelopes, called flats, which starts at $0.98 and also adds $0.22 for additional ounces.owever, two first-ounce stamps covers three ounces for a letter. The first table below shows the costs for up to 13 ounces and the number of first-ounce stamps needed when you don't have additional-ounce stamps.