Just got a little more expensive. Postal rates for a first class letter goes up one penny today to 42 cents each.
REMEMBER - the forever stamps are 'forever' and do not have a $ value to them, they are good for any normal first class letter, 41 cents or 42 cents. Use them up! Should have stocked up on them a while ago!!
For more info, you can go to their website: usps.com