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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.
Comments (7). The United States Postal Service increased its rates for first class postage and related services (like insurance) on Jan. 27, 2013. The price of a first class Forever stamp increased to 46 cents from 45 cents. The cost to mail a first class letter is 46 cents for up to one ounce, and each additional ounce adds 20 cents.