USPS prices are going up May 12, see here for infohttp://www.usps.com/prices
I had foolishly bought a book of 41 cent letter stamps a few weeks ago instead of the 'forever' stamp. Why? I picked out something pretty and forgot there was even a forever stamp.
Normally that's too many to use within a month or so and I was not happy looking forward to purchasing those pesky 1 or 2 cent stamps to make up the difference.
Without rushing anything, I just so happened to have 2 fairly light envelope packages to send out (one was a prize to a winner in my trivia contest at Pretty Cheap Jewelry and the other was a request for items from my sister).
Weighing the envelopes at the post office scale, it was karma that I had just the right number of stamps to cover the costs for each!
Yay! And I will not make the mistake forgetting to buy forever stamps anymore. Even though they are not as pretty.