There are a few increases to the USPS rates here in the U.S. The fine folks over at Fiddlers Green have made a handy chart to help you see what those are.
Here's the direct link to download the full chart: https://www.fiddlersgreenzine.com/s/usps2021.pdf
Learn more about Clint and his amazing magazines: https://www.fiddlersgreenzine.com/