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no way it is that much... you do not have to send it as priority mail, it will just take a little while. i sent a package (16 pounds) for 60 bucks airmail, but if i woulda sent it regular, it would have cost me way less. just go and ask (or have your friend go and ask )

Unfortunately you have to send it via airmail. Since mid-2007 Surface mail is no longer available from the USA. USPS has the lowest prices of the major carriers, but $90 for 20lbs is quite accurate I am afraid.