Good price on heavy duty gun cabinet. I'm not calling it a safe. I've seen too many videos of these being opened like a tin can. But, it'll keep kids out and thieves that are in a hurry.
https://www.atwoods.com/rhino-metals-kodiak-40-gun-safe-55x29x20.html
https://www.atwoods.com/rhino-metals-kodiak-40-gun-safe-55x29x20.html