(2) The board may negotiate more than one contract with one or more companies or associations if necessary to obtain optimum coverage at minimum cost.
(3) No premium or other periodic charge on any insurance or service contract shall be paid unless the insurer or hospital association issuing such policy or contract is authorized to transact business as an insurance company or hospital association in this state.
(4) Expenses incurred by a district in establishing programs or providing benefits authorized by ORS 450.082 and this section are expenses for which a district may levy taxes as provided by ORS 450.170. [1967 c.439 §§3,5]