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the cost of shipping is how much it would cost to ship them flat rate

To calculate domestic prices or international prices , visit USPS Homepage or call 1·800·ASK·USPS.

One ounce is approximately equal to three sheets of paper plus a standard envelope.

Express Mail®
Flat-Rate Envelope $17.50

Express Mail prices are based on weight and distance.

For Sunday/holiday delivery, add $12.50.
Prices are available up to 70 lbs.
For complete Express Mail prices, see the domestic postage calculator.

Priority Mail®
Flat-Rate Envelope $4.95

Priority Mail Flat-Rate Boxes are available, regardless of the actual weight of the piece up to the 70-lb. limit, at the following prices:

Small Flat-Rate Box
• Domestic or APO/FPO addresses: $4.95

Regular/Medium Flat-Rate Boxes
• Domestic or APO/FPO addresses: $10.35

Large Flat-Rate Box
• APO/FPO destination addresses: $11.95
• Domestic address: $13.95

For complete Priority Mail prices, see the domestic postage calculator.

http://pe.usps.com/text/dmm100/postage.htm