That depends on where you are sending it from, which you have not stated. If you go to your local post office they will give you the current prices.
60c-90c
$1.36
At the current time, March 2013, it costs €0.82 to send a normal letter from Ireland to Canada.
€2
The cost of air mailing a letter from Australia to Ireland is $2.60. A registered letter is about $22.00. It takes three to ten days for the transit.
1 ounce - a card or 4 page letter = .90 cents
No.
There are various prices for stamps in Ireland. To send a letter in Ireland to other parts of Ireland, the price is 55 cent.
700 Stamps
3 stamps!
An ounce of International First Class mail is 98 cents.
For a standard letter it is €0.82 although if you want to send something larger the costs would of course increase.