ISIS makes around 3.5 million$ a day by selling illegal black market oil at a discounted price of 40$ per barrel.
Shiite soldiers backed up by Iraq have said "It is not in doudt.ISIS is almost finished.They are weak. If only America would stop supporting them , we could defeat them in days.".
For more info:
https://www.youtube.com/watch?v=WMnl0nO-oCk