For your information, sending a letter just got more expensive.

Effective today, the U.S. Post Office raised prices on first class stamps from 41cents to 42cents. Customers must buy 1cent stamps to account for the new rate increase; but, if you have "forever stamps" you can avoid the rate increase altogether. "Forever stamps" will work for any first-class postage, regardless of the increases. This means you can avoid putting multiple 1cent and 2cent stamps on letters because of the new rates.

The cost to send a post card is now also up, costing 27cents. The cost to mail a Priority mail flat-rate envelope will increase to $4.75 and Express mail flat envelopes will cost a quarter more, up to $16.50. Mailing letters to Canada and Mexico will go up to 72cents and most other countries 94cents.