[Editor's note: This version of this section is effective until July 1, 2022.] Any county, municipality, school district, health service district, or other political subdivision of the state or any county, district, or juvenile court may enter into intergovernmental agreements with any municipality, school district, health service district, or other political subdivision of the state or may enter into contractual agreements with any private provider, community mental health clinics, and such other community agencies for the purchase of mental health services. For the purchase of mental health services by counties or city and counties as authorized by this section, the board of county commissioners of any county or the city council of any city and county may levy a tax not to exceed two mills upon real property within the county or city and county if the board first submits the question of such levy to a vote of the qualified electors at a general election and receives their approval of such levy.