fourth class book rate
the crimethinc diy guide says,
“It’s a real tragedy how few people know how much money can be saved by learning the various rates you can send things at the post office. Don’t send everything first class – that’s a ridiculous waste of money. For records, CDs, and ‘zines, there’s another class, called “Fourth Class Book Rate,” which is much cheaper, if about a week slower. They won’t offer this to you unless you bring it up yourself. Use their terminology (reproduced in quotes) so they assume you know as much about this shit as they do. If they are dubious (“Is this really a book?”) you say: “It’s in excess of fifty pages, permanently bound, no letter or message enclosed” — even if that’s not the case, as long as it could be looking at your package. You can also it’s a record with music on it, if that’s clearly what it is, and they’ll give you the same rate.”