If the proposed improvement consists of the purchase of an existing improvement, the board of county commissioners may in their discretion, after the creation of the special improvement district and after ordering the proposed improvement, enter into a contract for the purchase of said improvement, upon such terms as they deem just, without advertising for bids or proposals; provided, however, that the total purchase price shall not exceed the amount set forth in the notice required by 7-12-2105.
§ 7-12-2133, MCA