By Katie Kerwin McCrimmon Colorados new health exchange will cost an estimated $22 million to $26 million a year starting in 2015, spurring managers to consider advertising, taxes on insurance companies or fees charged to employers and consumers using the exchange to pay for it. The U.S. Department of Health and Human Services formally approved Colorados exchange on Monday, making the state one of the first six in the country to approved to open for enrollment next October. Other states that will use a federally-run health exchange will pay fees of about 3.5 percent on the premiums that each person…