Wyo. Stat. § 41-10-136
General obligation bonds, revenue bonds or special assessment bonds shall be sold at public or private sale for not less than the principal amount thereof and accrued interest, or at the board's option below par at a discount not exceeding five percent (5%) of the principal amount thereof, for the payment of the contractor or contractors, for the acquisition of property and rights thereto, including but not limited to labor, supplies and materials acquired by the district or supplied under agreement with the United States of America, the state of Wyoming, or a federal or state agency, instrumentality or corporation or other political subdivision and for all proper incidental expenses; provided, however, the bonds may be delivered to the contractor or contractors. If delivered to the contractor or contractors, the bonds shall be accepted for the principal amount thereof, plus interest due thereon to the date of their delivery, in payment of the amounts due under the contract or contracts, and the contractor or contractors may be required to accept delivery of all or a part of the remainder of the authorized issue of bonds and to pay therefor the principal amount thereof and accrued interest to the date of delivery, so that money will be available to the board to be expended in the payment of the incidental expenses for the payment of which the bonds were in part authorized. No special assessment bond interest rate shall at one (1) time exceed the interest rate (or lower or lowest rate if more than one (1)) borne by the special assessments, but a bond interest rate may be the same as or less than an assessment interest rate, subject to the aforesaid limitation, as the board may determine. In advertising for construction bids, the board may stipulate that the contractor must accept bonds in payment of the contract price.
W.S. 41-10-136