Have an old hard drive sitting around?
Here is an 'ible to make a safe out of it!!!
Step 1: Materials!!! *what else?*
1. old broken hard drive
2. money or valuables
3. A drill or screwdriver with a hex bit *i think that's what it's called
4. a hard drive case
5. A hard drive case key.
6. assorted tools....like pliers and flat blade screw drivers for pulling things out