I've been lucky enough to pick up a couple of iPads and an iPhone from the American base I'm working on, but they come with the US slide-in adapter for the power supplies.
You can use any simple adapter you purchase from electronics stores. They don't even need to convert the current. I believe Apple's iPad/iPhone adapters use 100-240V, so a straight adapter should work. If you require other travel adapters, then the Apple World Travel Adapter Kit might be a better solution.