There are many insurance companies that are authorized for payroll deductions. Insurance companies that are authorized must pay a fee each month in order to have premiums deducted from an employee paycheck. By having a "service agreement" arrangement, the state does not endorse these companies or their products.
If you are interested in your insurance being payroll deducted, contact the insurance company and ask them if they are authorized for payroll deductions within state government. If they are, make arrangements with them for payroll deductions.
Insurance agents are not allowed to visit work areas to "sell" their product. Solicitation is not permissible during office hours. If you are interested you must contact them and make arrangements for them to visit your home or you may talk with them on you lunch period or break.