The best way for books is USPS Media Mail. By far the least expensive, but the slowest. 2nd best is USPS First Class mail (up to 16 oz). Almost as fast as priority, but with weight limit. Priority mail you may find a flat rate box depending on the book size, but with or without flat rate priority mail will cost you.
Anything else including express mail, UPS, or FedEx will cost more.
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