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The standard size for a postcard is 4x6" and the biggest size is 6x11". I am not sure if there are postcards smaller than the 4x6".
The postage for a postcard is valued at $0.33 as of 2014. This can vary depending on the size of the postcard and may change as the Postal Service changes its rates.
As of right now (August 2008), postage for a postcard from Quito, Ecuador to the US is $1.56
To mail a first class international postcard to Canada, you will need to attach $1.10 in postage. The maximum size for a postcard is 6" in length x 4.25" in height.
postcard is .98 cents
Yes, you can use a Forever stamp on a postcard, but it's overpaying for postage.
You will need a postcard stamp. They currently cost $0.29.
62p.
Currently, 34 cents.
For a postcard that is 6 inches long by 4 and 1/4 inches high, first class postage in the US is 27 cents as of June 2008.
postage for a postcard sent from Australia to the U.S. costs AU$1.40.