For use as an unobtrusive and inexpensive alternative to purpose-built weapons safes, I recommend finding an old, non-functional soda vending machine. Remove the guts (we call it the ‘stack’) and refrigeration system, but leave the lights in the door. (Be careful, the light ballast wiring will bite: 5,000 volts).
Tap into the 110 Volt AC wiring on the vending machine to power your Goldenrod Dehumidifier.
Store your valuables inside where the guts used to be. Lock the door and keep the key. [If it will be at your private business but in a location that might ever be in view of the public,] you can leave the machine plugged in, with the lights on, and an ‘Out Of Order’ sign taped on the front. Consider this instant stealth storage. – Tom K.