Cal. Pub. Cont. Code § 20304

Notwithstanding Section 20301, the board may direct the purchase of any supply, equipment, or material without observance of any provision requiring contracts, bids, or notice upon a finding by a vote of two-thirds of all its members of the board that there is only a single source of procurement therefor and that the purchase is for the sole purpose of duplicating or replacing supply, equipment, or material, as the case may be, in use.