Notwithstanding the provisions of any retail installment contract to the contrary, any buyer may prepay it in full at any time before maturity without penalty. (Added 1961, No. 227, § 7, eff. Jan. 1, 1962; amended 1967, No. 58, § 3; 1989, No. 122, § 8, eff. June 30, 1989.)