It's a pity that their supplied information is wrong, is there other way?

They have a somewhat involved way of accepting credit/debit card (involves you mailing or faxing bills or something, IIRC), and I think they also take money orders & cashier's checks. But personal check seemed the easiest method for me, all in all.

Cheques aren't only in the U.S., but they do seem to be rare in most of Europe any more. However, as long as your bank is willing to make a cashier's cheque for you, then it looks like Intrade can use it.