TexasCHLforum.com

I bought my garage safe earlier this year and spent some time researching the issues. The size issue really matters if you use the safe to store ammo as well as firearms and or other personal property. Bolting the safe down prevents it being tipped over as stated earlier. If you are installing it in the garage against the wall check to see if there is baseboard on the wall where you plan to install the safe. If there is, either remove it behind the safe or shim out the area with filler to prevent a cable being slipped over the safe and behind it to keep some one from winching or towing the thing over. The easiest method is use plywood the same thickness as the baseboard (usually 5/8" for modern baseboards).
In speaking with people at the safe store, most of the safes now are cut open through the sides or top. Turns out that the heavy duty steel is used in the door and frame and thinner metal is used in the sides, top and back. Most safes are made in Mexico or China. The American made ones usually come from Utah. They tend to be the best quality and are priced accordingly.
The safe store people often have scratch and dent units that they are willing to deal on. I found I was able to negotiate best just prior to an upcoming gun show on a safe that they were going to load up and try to sell at the show. They saved themselves a fair amount of work not hauling it there and that was a factor in the calculations.
Final note, if you are not planning to transport and install the safe yourself, plan on spending anywhere between $125 and $250 depending on size and distance for the delivery and installation.