Any other provisions of this chapter or any other law to the contrary notwithstanding, if the principal amount of an issue of public revenue bonds is fifteen million dollars or greater, the official or governing body in charge of the bond sale may, if the official or governing body deems it advisable and in the best interests of the public, sell the bonds at private sale without the necessity of public advertisement or the taking of competitive bids and at a price above, at, or below par, plus accrued interest, as the official or governing body deems advisable and in the best interests of the public.