Effective Monday, May 11, the rate of a first-class postage stamp will increase from $.42 to $.44. If you have a chance, it might be worth it to pick up a few extra books or rolls of first-class stamps today before the price increase goes into effect.
Especially if you are planning an event or have other extensive postage needs coming in the near future, you'll definitely want to get your stamps now! When you purchase First-Class Forever stamps, they will always cover the cost of your postage, no matter how the rate increases. So it's to your advantage to stock up on stamps now before the price goes up.