In case you have time on your hands to carve out your favorite 2" thick hardback, here's an idea...
 

Click image to enlarge

 
FYI...it is a MAJOR pain in the rear, but it pretty slick once it's finished.  Don't leave this lying around the house or in the coffee shop.  

Where's Rook and his .500? I bet that would fit.
 
I actually did the same thing with a copy of the book of mormon (showed up on my door step one sunday morning). I cut it to fit my Llama micro-Max. I don't use it, but I thought it would be funny to try.

I've made more than a couple and given them away through the years.  I prefer to use a glue stick to stick all the pages together, except for the first 10 or so at the beginning, then use a ruler and an exacto knife to start cutting 5 or so pages at a time (depending on thickness of pages).  The trick is to keep the edges vertically straight, and not let them angle in toward the hole the deeper you cut.  Then I use hot-glue to stick them all to the back cover.  Once done, I like to finish the raw cuts on the inside by gluing felt on the inside of the hole, but that's just because I'm CDO (it's kind of like OCD, but in alphabetical order, like it should be).  
 
I've though about using spray adhesive instead of glue sticks, as it may be faster, but messier... you don't want to use a heavy glue, like Elmers, as it will cause the pages to 'wrinkle'.  It's a fun little task while wasting time watching chick flicks with the lady.
 
Cy

We have a person here in town that does books this way for security storage.  He glues the edges, then uses a band saw to cut the hole.  He glues the pages to the back of the book.

Tried that a few times as a kid.  Absolute pain in the tail, and I had pages tearing on the edges etc before I even got through the first few chapters of the book.  I love the idea (though I'm thinking that an old fashioned "stash can" in my messy pantry might be best for small things, like some emergency cash), but in the event I ever decide I must have one I'll buy a handmade one on eBay or something.
 
In short:  I like the idea, but given my poor previous performance and the relative cost of buying these things vs paying for Xacto knife-induced stitches, I'll buy one if I need one.  Those with more coordination and/or better tools could probably easily make one.

Great Idea!
 
I need to hit the Used Book Store.
Maybe they have an old bible?
Saw that in a movie once.

Lots of safes for under $20 that look like real paper books
 
http://www.google.com/products?q=book+safe

Quote from karlsgunbunker on 06/14/10 at 22:37:39:

I thought about trying a Bible a few years ago but the pages are so thin, I really don't think it would work. Quite possibly it would be easier to use the cover of a Bible but the pages from a book the same size. That way you wouldn't have to fight with those super thin pages in the Bible.