I have a ton of these, mostly 40mm and 50 cal. ones. They are very practical and organize a lot of my shooting gear very well. A friend of a friend buys them through government liquidation and other auction sites, has the space to store them, and then sells them to people for good prices. I'm pretty sure I only paid $20 bucks a piece for the 40mm ones!
RE: Why Buy Ammo Cans? 25 Survival Uses