Lol, that's actually similar to how I got into commerical safes. New safes start around $5k, but even relitively new used safes can be purchased for a few hundred bucks. It's really amazing how much they depreciate the moment that they get installed and their bottom touches the ground. So few people know how to move them that they just end up being next to impossible to sell when they are sitting on the ground. All you need is a johnson bar, a pallet jack, and a few piece of scrap lumber and you can slowly shimmy the safe up onto the pieces of scrap lumber. Once you got the entire safe up on top of the lumber you just slide a pallet jack underneath and away you go. Just get it onto a box truck with a lift gate or if the safe is big enough rent a piggyback. The biggest safe that I've purchased and flipped weighed 3,850 lbs TL-30. Between my friend and I we each made off with a $1k in profit after we got it back home and sold on eBay.

My personal safe is only a modest 2,000 lbs TL-30 that I replaced the combination lock with a nice electronic lock and built a custom interior for guns. The safe door is 1-1/4" of plate steel and the rest of the body is 1" plate.