Postal cards and stamped envelopes

§ 2503. Postal cards and stamped envelopes (a) The Postmaster General shall furnish for public use postal cards and envelopes with postage stamps printed or impressed thereon. (b) Stamped envelopes shall be sold as nearly as possible at cost, but not less than cost. Cost includes the value of the postage stamps, salaries and clerk hire, and other expenses connected therewith.