Where can I get a money order in US dollars in Poland?

My wife tried to get one from the post office but they said they couldn't do it in US dollars. We've tried a few banks and even a few Western Union branches but no luck so far. Does anybody have any experience or suggestions on this?

Years back I tried but couldnt find it..best way was to pay by credit card or wire money!or mail an US bank check most places do accept checks on phone with your banks routing number and bank acct.

thanks for the suggestion but I need to specifically provide a money order for what I'm trying to do - it's very frustrating that they are requiring it instead of allowing me to pay by credit card but I can't really do anything about it.