To all of you brides out there - this is a great tip and heads up!
If you're planning on mailing a large quantity of anything this year, I highly recommend ordering forever stamps TODAY! Pricing changes 1/27 from $0.50 to $0.55 for one ounce letters. I place orders through USPS.com - no post office lines, plenty of *pretty* options, and shipping is always $1.75. I just stocked up and ordered a haul of over 500 stamps!
*Note that heavier wedding invitation suites (thicker paper, envelope liners, etc) will require a two ounce stamp. I always suggest taking one, fully assembled suite to your post office and having them weigh it for you to confirm.