Where would you store your firearms safely if you wouldn't have the option to keep it at your residence and your local bank wouldn't allow to store it in safety deposit box and also you wouldn't have trustworthy living close by?
idk why you couldn't keep it at your residence if you were able to put it in a half way descent safe?? the cheapest route................otherwise given the situation I would say a trustworthy person who's not as close...or look into a access controlled storage unit with CCTV system...and electric....maybe put them in a safe in the unit with good dehumidifying capability