I keep a few hundred around, plus my change collection is probably at least that much since I haven't rolled it up in years. We have a safe (unbolted, 150 lbs.), but I'd like to have a less obvious stash.
Just last night I was reading about building secret compartments, mostly for fun in my woodworking life, but also thinking about hiding a few things like more cash, old gold jewelry, a gun, whatever (wink wink, nudge nudge). I found a couple that look like easy fun. I especially like the one hidden in the wall. I wish I'd read this one before the house was finished.
Cheap secret compartment!
Building a secret compartment - DIY Chatroom - DIY Home Improvement Forum
I also like the like the comment about drywalling the gun directly into the wall, and just punching through and grabbing it if you need it.
When I get into more serious furniture building I'm going to try some fancier secret compartment building. But for now I think I'll give that bookshelf box a try.