Alabama constitution
Article XI: taxation and finance
Section 213.25

(b) All bonds issued hereunder and the interest thereon shall be payable from any funds in the state treasury not otherwise appropriated. The bonds shall be payable in substantially equal installments of principal and interest beginning in the next fiscal year after their date; they shall bear interest at a rate not to exceed 2 1/2 % and they shall contain a provision for their call for payment at such a time or times prior to maturity, and at such a premium, if any, as the governor may prescribe in the notice of sale. All bonds issued hereunder shall be sold to the best bidder at a duly advertised public sale, on sealed bids or at auction, and shall not be sold for less than par and accrued interest; provided, bidders may be invited to name the rate or rates of interest, which the bonds are to bear. The right to reject any or all bids shall be reserved.