(a) The bonds may be sold as the commission determines by resolution. The commission may sell the bonds at a price below par; provided, however, that the discount on any bonds so sold shall not exceed 5 percent of the par value thereof.
(b) Before selling the bonds, or any part thereof, the commission shall give notice inviting sealed bids in any manner as it may prescribe. If satisfactory bids are received, the bonds offered for sale shall be awarded to the highest responsible bidder. If no bids are received, or if the commission determines that the bids received are not satisfactory as to price or responsibility of the bidders, the commission may reject all bids received, if any, and either readvertise or sell the bonds at private sale.