Yes, postage stamps require that you pay for them. That is how the postal service gets its revenue so that it can do business. Postage goes up when the cost to deliver exceeds the cost taken in.
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States do not issue postage stamps. Only the Federal Government can issue postage stamps for US mail. However, each state has had numerous stamps issued honoring them. There have been sheets of state birds and state flags issued. And many get recognized on the anniversary of their statehood.
No, all stamps do not cost the same. Stamps have a face value and that is their cost. Stamps are available in many denominations typically to cover a variety of weights and services for mail.