Okla. Stat. tit. 11, § 11-37-218: Awarding of contract - Aggregate cost

At the time and place named in the notice for proposals to

contractors, the municipal governing body shall examine all bids

received. Without unnecessary delay, the governing body shall award

the contract to the lowest and best bidder. Contractors' bids shall

not be held valid longer than forty-five (45) days after the

deadline for filing the proposals with the municipality. The

aggregate amount of the contract shall not exceed the aggregate

estimate of cost submitted by the engineer. The governing body

shall have the right to award a contract for all or a portion of the

improvement or to reject any or all bids, and to readvertise for

other bids when any bids are not, in its judgment, satisfactory. The

letting of the contract shall not be complete until the contract is

duly executed and the bonds approved.