YSK: If you live in the US, forever stamps are going from 63 cents to 66 cents on 7/9/23
You have a couple days left to buy stamps that can be used to mail letters after the price increase.
If you buy 10 forever stamps at 63 cents, you can use one for each letter in the future regardless of future price increases.
Stock up! Prices will likely never go down.
I bought a few hundred dollars worth to cover holiday cards for the rest of my life.
(Edited title since originally I said 6 instead of 7… thanks for folks correcting me)