Okla. Stat. tit. 19 § 733
The board of county commissioners shall cause an advertisement for bids for the erection of such buildings to be printed in some newspaper printed in the county, or of general circulation therein if there be no newspaper published in said county, for a period of at least thirty (30) days prior to the date set for the opening of bids, and in such other newspapers in the state as the board may deem advisable. Such advertisement shall give the place where the plans and specifications may be examined, the date on which bids will be opened, the time which will be allowed for the completion of such building, and such other information as the board may direct. Bids may be opened, considered, passed upon, and contracts for the erection of said buildings let at any regular session of said board, or at a special session thereof called for such purpose, but in all cases the bids must be opened and contracts let in open session of said board. The lowest responsible bid must in all cases be accepted unless all bids are rejected, and the contract for such buildings shall be so conditioned that not more than ninety percent (90%) of the price agreed to be paid for the construction thereof shall be paid until the terms of the contract shall have been fully complied with and the buildings completed to the satisfaction of the board and accepted by them. The said board of county commissioners may require to be filed with each bid a bond, or in lieu thereof a certified check, conditioned that the bidder will enter into a contract with approved security for the performance of the work in accordance with the plans and specifications in case his bid be accepted, and, when such contract is awarded to any such bidder, such bidder shall execute to the county a good and sufficient bond in the sum of such contract, with two or more sureties, to be approved by the board of county commissioners, conditioned for the faithful and full performance of such contract.
Okla. Stat. tit. 19, § 733