Language courses on iOS are free at the moment, they're normally $15.99. I got the German one. Don't know how long they'll be free for, it doesn't mention it anywhere in the app description.
EDIT: when i first downloaded mine it had all the content in it. Now only one lesson is free and you've gotta pay for more. Not as good a deal or bargain as I initially thought, it is essentially expired. Thanks for the feedback everyone.
Other languages available:
The Spanish, English and French ones are still $15.99. They must like those languages extra special.
Happy Australia day everyone.