Okla. Stat. tit. 62, § 62-120.3: Advertisement and bids

In connection with every cash sale of state equipment, for the

purpose stated in this act, the purchasing officer of department,

institution or agency shall either publicly advertise the sale of

equipment or secure at least three bids in writing, unless the

estimated sale value is less than Fifty Dollars ($50.00). The

record sale, including all the bids received, shall be considered a

matter of public record and shall be so maintained for a period of

not less than ten (10) years.