Where were the Oompaloompas recruited from for Willie Wonka and the Chocolate Factory?

If you are talking about the first movie with Gene Wilder the Oompaloompas were recruited like any other actors, obviously with the requirement that they were under a certain height. In the Johnny Depp movie there was only one actor, Deep Roy, and he was multiplied by the magic of computers. However, in the book they were recruited from the deepest, darkest jungle of South America where they loved Cacao (or cocoa) beans, but spent most of their lives desperately trying to get some, instead of having to eat mashed up grubs. Willy Wonka's promise that, if they came to work for him they would have enough cacao beans to eat for the rest of their lives, was enough to coax them to come and work in his chocolate factory.