Better buy all the Forever stamps you can from the U.S. Postal Service (USPS) because the rates are going up.Starting Jan. 21, 2024, the new prices will increase the cost of a First-Class Mail Forever stamp by two pennies from 66-cents to 68-cents, according to the USPS website.Forever stamps, first issued in 2007, remain valid for full First Class Mail postage no matter when the price increases after their purchase.The rates were last increased July 9 of this year when the cost of a first class stamp went from 63-cents to 66-cents.This is not the only price adjustment. Other types ...