Oil them up and wrap them in a cloth sprayed liberally with silicone.
Then put them in a container to prevent the oil and silicone from escaping.
Cheap and effective even in a high humidity area.
Been doing that for many years and it seems to keep them good for at least a year.
Walt Kelly, alias Pogo, sez:
“Don't take life so serious, son, it ain't nohow permanent.”