I've been taking an Indonesian course in Yogyakarta for two months now. I'm a big fan of self-learning, but honestly I have a hard time coming up with good ways to learn this language outside of an immersion environment. That is to say, as you folks have found there isn't a ton of great course content. Even in the university libraries that's the case...
A lot of nonfiction has been translated to Indonesian and is readily available in bookstores. There's an interesting genre of travel literature geared toward Muslim travelers, for instance Keliling Asia, Memburu Cahaya by Tari Lestari. It's a very short read about the author's experiences as a Muslim solo female traveler going to non-Muslim countries in Asia.
Hands down I recommend the LINE Kamus Inggris dictionary app. Native speakers generally agree with the example sentences, and I find myself relying on it a lot in my course.
I've only seen one Indonesian movie in country so far, called Negeri Dongeng. It's a documentary about a group of mountaineers trying to scale the highest peaks in Indonesia. It's pretty gripping just from the visuals. The theaters in Yogya don't have subtitles.
If my presence in the country can be of service to your learning in any way, feel free to ask!