According to state government’s own estimates, costs could range between $57 million and $89 million per year – without a single dime going to patient care. But these estimates are not based on what the state is now spending (through federal grants) in key areas that would become the responsibility of Illinois should a state-based exchange be adopted.
http://www.illinoispolicy.org/cost-of-a-state-based-obamacare-exchange-underestimated-in-illinois/