(a) Whenever bonds are so issued, they shall be offered for sale at not less than ninety-eight per cent of the principal amount and accrued interest and shall be sold by the Governor, the Auditor General and State Treasurer to the highest and best bidder or bidders after due public advertisement, on such terms and conditions and upon such open competitive bidding, as the Governor, Auditor General and State Treasurer shall direct. The manner and character of such advertisement and the times of advertising shall be prescribed by the Governor, the Auditor General and the State Treasurer.

(b) Any portion of any bond issue so offered and not sold or subscribed for may be disposed of by private sale by the Governor, the Auditor General and the State Treasurer, in such manner and at such prices, not less than ninety-eight per cent of the principal amount and accrued interest, as the Governor shall direct. No commission shall be allowed or paid for the sale of any bonds issued under the authority of this act.

(c) When bonds are issued from time to time, the bonds of each issue shall constitute a separate series to be designated by the issuing officials or may be combined for sale as one series with other general obligation bonds of the Commonwealth.