Cardas makes nice spade lugs that accept banana plugs. They are not cheap but are well made. https://echohifi.com/details/5674/Cardas_Spade
Nakamichi makes a cheaper version: https://echohifi.com/details/14032/Nakamichi_Banana-to-Spade
Nakamichi makes a cheaper version: https://echohifi.com/details/14032/Nakamichi_Banana-to-Spade