Originally Posted by Kathy N
I happened to get one without the words which allows them to charge whatever postage they want.
This is just plain not true. They don't randomly charge whatever they want just because they don't like what you're wearing or something! The postage rates for Priority Mail are based on weight and distance. You can get an estimate of any rates, compare them, whatever you want at the USPS website. It doesn't have to be a surprise when you are at the PO. Be an informed consumer.
http://www.usps.com/tools/calculatepostage/welcome.htm