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The 5x5 and 7x7 square shapes do require a surcharge since they are square instead of the rectangular, so the post office will charge and extra "non-machinable" rate for these. But they do now offer a $.64 stamp just for the square greeting cards as long as they are under 1 ounce.
Some info from the usps.com website:
Using the Butterfly stamp
Today’s high-tech letter sorting technology enables machinable First-Class Mail letters to be processed at a cost of 44 cents for the first ounce and 17 cents for each additional ounce up to 3½ ounces. Non-machinable letters such as square envelopes, envelopes with the address parallel to the shorter dimension, and envelopes containing odd-shaped items cannot be processed on today’s high-speed mail sorters and a 20-cent non-machinable surcharge is applied for the additional handling costs.
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The 64-cent Butterfly stamp incorporates the non-machinable surcharge and can be used for square greeting cards and other non-machinable envelopes weighing up to one ounce.
For more information on the USPS guidelines, visit this link here: http://pe.usps.com/text/dmm300/101.htm.
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