"Forever" stamp prices are rising again. Here's when and how much they will cost.

Starting next week, the price of a "Forever" stamp will increase by a nickel to 73 cents, the second time the United States Postal Service has raised the cost of postage this year. 

The price of a Forever stamp has steadily climbed since they cost 41 cents when the USPS introduced them in 2007, most recently in January when the agency raised the price from 66 cents to 68 cents. 

Other postage rates are also set to jump. Mailing a postcard domestically will cost 56 cents, a 3-cent increase, while the price of mailing postcards and letters internationally are both rising by a dime to $1.65. Overall, postage costs are rising 7.8% increase, USPS said in a statement in April.