There are various prices for stamps in Ireland. To send a letter in Ireland to other parts of Ireland, the price is 55 cent.

Philip W. Ireland has written:

'China' -- subject(s): Postage-stamps, Topics, Dragons

Yokiti Yamamoto has written:

'Japanese postage stamps' -- subject(s): Postage stamps

'Japanese postage stamps (for philatelists)' -- subject(s): Postage-stamps

No. Postage to Ireland from the US is 98 cents, but only 44 cents for domestic letters.

Yes, every country uses postage stamps.