Buying insurance through the government program known as COBRA would temporarily become a lot cheaper. COBRA, for the Consolidated Omnibus Budget Reconciliation Act, generally lets someone who loses a job buy coverage via the former employer. But it’s expensive: Under normal circumstances, a person may have to pay at least 102 percent of the cost of the premium. Under the relief bill, the government would pay the entire COBRA premium from April 1 through Sept. 30. A person who qualified for new, employer-based health insurance someplace else before Sept. 30 would lose eligibility for the no-cost coverage. And someone who left a job voluntarily would not be eligible, either.