This act shall not affect any existing laws, special or general, authorizing a charge for the loan of money in excess of interest at the legal rate. This act shall not apply to any person, persons, partnership, association or corporation operating under the laws related to banking institutions, building and loan associations, credit unions or licensed under the Small Loans Act, approved June seventeen, one thousand nine hundred fifteen, and supplements or amendments,¹ or licensed by the Secretary of Banking of the Commonwealth of Pennsylvania under the provisions of any other statute. This act shall not apply to any bona fide sale of personal property by a person regularly engaged in the sale of such personal property, wherein the purchaser may pay any part or all of the purchase price in stated installments, nor to any such bona fide sale under a conditional sale contract, lease or bailment, wherein the purchaser, lessee or bailee has the option of becoming, or is bound to become, the owner of the property upon full compliance with the terms of the agreement. This act shall not apply to nonprofit corporations organized under the laws of the Commonwealth of Pennsylvania having memberships consisting exclusively of duly licensed physicians, surgeons and dentists, operated exclusively for and by their members, and engaged in, among other activities, the financing of personal obligations arising from the rendering of professional services by the members of such non-profit corporations, which are limited strictly to medical, surgical, dental, operative, diagnostic and treatment services, or nursing and hospital care.