agus I am not sure where Poles get theirs but for Brits and Yanks it is the country's driving club that issues them for something like 10usd or so and they are good for one year. You can get them through the mail by printing and application and mailing it with the fee and photo.
There are websites that sell them for very high prices and say they have cards good for 5 or 10 years...these are scams. They may work with an unknowing police officer but they are not valid and the prices are very high. The only REAL permits are from the driving clubs and must be accompanied by your country's driving license to be valid...alone they are useless.