Missouri Revised Statutes Title IV. Executive Branch § 34.044. One source of supplies, waiver of competitive bids and proposals--rescission of waiver, when--single source exists, when--advertising waived, when

1. The commissioner of administration may waive the requirement of competitive bids or proposals for supplies when the commissioner has determined in writing that there is only a single feasible source for the supplies. Immediately upon discovering that other feasible sources exist, the commissioner shall rescind the waiver and proceed to procure the supplies through the competitive processes as described in this chapter. A single feasible source exists when:

2. On any single feasible source purchase where the estimated expenditure shall be ten thousand dollars or over, the commissioner of administration shall post notice of the proposed purchase. Where the estimated expenditure is one hundred thousand dollars or over, the commissioner of administration shall also advertise the commissioner's intent to make such purchase in at least two daily newspapers of general circulation in such places as are most likely to reach prospective bidders or offerors and may provide such information through an electronic medium available to the general public at least five days before the contract is to be let. Other methods of advertisement, however, may be adopted by the commissioner of administration when such other methods are deemed more advantageous for the supplies to be purchased. The requirement for advertising may be waived, if not feasible, due to the supplies being available at a discount for only a limited period of time.