If you mail a lot of letters, you may want to buy up some “Forever Stamps” today or tomorrow.  The US Postal Service says that starting this Sunday, January 21, 2024, the cost of a Forever Stamp will go up to 68 cents.  Currently, the price is 66 cents.  The last time there was an increase in the price of the Forever Stamp was in July of 2023 when the price jumped 3 cents from 63 cents to 66 cents.  Forever Stamps can be used in perpetuity, no matter future price changes.  There will be no change to the price for an additional ounce per letter, which will remain at 24 cents.