I had a dry box when I was in my twentys, tried to control the humidity inside the box with silica gel but found that it was a total waste of time.
Dry my silica gel in the sun but the moment I bring them back into the house, everything turns pink immediately. Maybe you can get better quality silica gel now.
I can't afford a dry box back then, too expensive. After fungus appear in my lens, I brought them to a shop that claims to be able to service camera and lens to have my lens clean.
They charge me about a hundred dollars I think but I can still see fungus inside my lens. I was too young and naive to argue with the shop keeper about it.
Dump my SLR camera and lens a few years later.
I think a dry cabinet is a good investment for your equipment, in the long run it saves you the headache of seeing your equipment being ruin. Save up for a cabinet, forget about the dry box.