Notes from mailing "Good Economics":


I took 4 books to the post office on Monday to mail within the US (California, Chicago, etc) and each one cost $3.27 to mail via Media Mail. So, given that a forever stamp is now with 55 cents, you can mail the book anywhere in the US with 6 Forever stamps.
Make sure to write Media Mail somewhere on the envelope.....

I am not sure about International Rates. I think that those would vary more so best to take those books to a post office or talk to the mail room downstairs.