Yes, it is 75 cents for postage to Canada for the first ounce.
Go to the site below and click on the "Calculate Postage" tab.
Mail and stampage is based upon the weight of the mail. As long as the letter is still light, you shouldn't need more postage.
The cost of postage for a 6x8 card if it is within the limit of weight it will only cost one postage stamp, which is $0.49. If it weighs more, it will cost more and need to be weighed at the post office.
First class letters are $0.46 per ounce. A 15 page letter will weigh around 2.4 ounces. Which means the letter will cost around $1.00 for extra postage.
insufficient information it deoends on how much the card weighs but probobly one stamp
If the card is less than one ounce (oz) it will cost first class postage of 44 cents. You can use a Liberty Bell Forever stamp. This stamp has no denomination on it because once you buy it for current first class postage rate, you can use it anytime regardless if the postage rate increases. There are other options you can put on the card as well such as receipt confirmation, insurance, etc... These cost extra then the postage rate. If your card weighs more than one ounce then look up the rates on the US Postal service web site for more information.
To send something to Germany, you need to provide $1.50 in postage. This will ensure that it gets there in a timely manner and doesn't get returned to you.
$0.46 For one postage stamp at USPS. Most postcards made of paper will only require one postage stamp. Some heavier postcards may need extra postage. To determine how much is required, weigh the postcard before mailing it.
Postage rates are calculated by the weight and shape of an envelope. For a large card, or one that weighs 2 ounces, the postage is $0.91 as of May 2014.
Regular postage works to an APO or SPO address. Non-military, I don't know.
1st class letter price which is 46 cents as of Oct 2013