No one has yet figured out how to predict when you'll need an IDP: I needed mine only in Guyana, while Mr. Throttlemeister claimed only in Brazil and others say never.... I've also needed mine in Ghana, but only once in a half-dozen trips there. Current law says you need one in Florida (USA), too, although it probably wouldn't amount to anything until some cop got irritated with you.
It's not a complicated document, and would not be difficult to manufacture. No one's suggesting doing so, of course.