Beginning May 12, the United States post office is changing its rates (after doing so less than a year ago). First-Class Mail stamps will increase from 41 to 42 cents; however, those who have the Forever stamps can still use them--a savings of one penny per letter (or bill). I'm glad, because I've still got like 30+ of those Forever stamps, and it will probably take me forever to get rid of them, since I'm totally slacking on the submission front.
Anyway, the USPS increased its stock of Forever stamps expecting the demand to grow with the upcoming rate increase--so if you want to save a dollar for a roll of 100 or 20 cents for a pack of 20, go get 'em now before they run out of stock.
To read about the other rate changes that will go into effect starting May 12, go to http://www.usps.com/prices/welcome.htm?from=bannercommunications&page=prices.