This isn't related to Perl but to the postage aspect of your problem.
Those 24-cent stamps come in handy if you ever need to send first-class mail in large envelopes. The first ounce is $0.83, or 42 + 24 + 17.
First-class international letter to Group 1 destinations is $0.72 for the first ounce, so three of those is just right. Additional ounces internationally are $0.24 for Group 1 destinations as well up to 3 ounces. A 3.5 ounce letter is an additional $0.24 over a 3-ounce one.
You're probably already aware, but for the curious there is a USPS price guide at http://www.usps.com/prices/ with a page each for Domestic First Class Mail and many of the other rate types.
Are you posting in the right place? Check out Where do I post X? to know for sure.
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