You can order them straight from the Royal Mail in the UK and they will post direct to you. Visit the link.
If you are looking for older stamps from the UK, then a local stamp shop should have them for sale.
No, you have to use stamps from the country of origin of the mail. In this case you will have to use Italian postage stamps.
That is what stamps are for, to pay postage. In the US you buy postage stamps and put them on mail to any other country in the world.
US postage stamps do not expire -- they are always worth face value as postage.
Through internet we can easily purchase current international postage stamps.
Not in the United States. The US Postal Service approves the postage stamps.
No. When mailing items you use the stamps of the country of origin.
The US issued the first postage stamps in 1847.
No, you must use US postage stamps.
There were no postage stamps in 1752- the first postage stamp appeared in 1840 in England. The US was under British colonial rule in 1752. There was a postal service and Benjamin Franklin was the Postmaster General. I am sorry that I do not know the postage rates, I am pretty sure they varied with the distance the mail had to travel.
Ebay, but if you are sending one there from US you have to use US postage since that's your carrier and any int'l is expensive unless the card itself is important, I would wait until you have a package or letter.
No - Us stamps can only used on mail sent from the US.
ofcourse they do