The following website is my "bible" for figuring out what plug adapter(s) I need before each international trip, and it hasn't been wrong yet:
Many major airports in other countries have a shop where you can buy U.S./local adapters. Large hotels often have one you can borrow or rent, too, or can direct you to a local shop where you can buy one. To be on the safe side, once you know what type you need from the web site above, you can probably order them online ahead of time.
Hope this helps...