Just picked up two 50 cal WWII ammo cans off ebay. $38 delivered to door. Great shape, a little surface rust, nothing that will stop them from holding tools.
30 cal ammo cans are just to small for my tool holding needs.
I'm not sure why the 30's cost more than the 50's.... the 50s have many many more uses.
Now I just have to scrounge up some WWII Blue Point/Snap On tools to put in there.