The city council of a city of the metropolitan class shall have the right to purchase for investment of other funds, and the bridge commission and the city council shall have the right to purchase for retirement and cancellation, any of such bonds that may be outstanding, at the market price, but at not exceeding one hundred five percent and accrued interest and not exceeding the price, if any, at which such bonds shall in the same year be redeemable, but all bonds redeemed or purchased out of funds provided by the sale of bridge bonds shall be canceled and shall not be reissued.