Here is where you can find the First Class Stamp

The United States Postal Service (USPS) issues Forever USA stamps. Stamps are called “Forever” because they retain their full value regardless of future price increases. Realworldstamp.com supplies stamps online. Small businesses, enterprises, and online retailers can ship U.S. Postal postage with first class service at a discounted rate. Providing hot-selling stamps for the USPS, we are an independent vendor.To learn more please visit:https://www.realworldstamp.com/collections/first-class-stamps