As of August 11, 2011 its $0.64 for First Class Mail Letter
How much does it cost to send a padded envelope to canada weighing 9 ounces
17 cents
For the first ounce it will be 88 cents. There is an additional charge for the larger size. Each additional ounce is 17 cents.
First class 1 ounce is 2 cents. Two ounces in 3 cents.
Starting April 3, 1988, it was 25 cents. See the Related Link.
$1.90
how much postage for a 9x12 envelope weighing 6.6 ounces
In 2011 the cost of an ounce of mail was 44 cents . The second ounce went from 17 cents to 20 cents on April 17.
The postage rate changed in May 2008. It was raised from 41 cents to 42 cents on May 12th. The second ounce of postage remained at 17 cents.
The postage rate in July 2009 was 44 cents. It was raised from 42 cents to 44 cents on May 11th. The second ounce of postage remained at 17 cents..
In 2011 the cost of an ounce of mail was 44 cents . The second ounce went from 17 cents to 20 cents on April 17.
In the US the first ounce is 44 cents. The second and each additional ounce is 17 cents. And if the envelope is not 'flat' or oddly shaped it may cost more. (10/09)