The USPS is changing postal rates again, and people are rushing to snap up Forever stamps before the new rates go into effect. Starting May 12, first class stamps will rise to 42 cents, continuing that annoying tradition of involving pennies in postal pricing. Trendy square greeting cards will now be priced at 62 cents, making it even harder to be hip. Everyone's favorite traveling companion, the postcard, remains relatively affordable at 27 cents. The......