The thing that bothers me is that, once you have the helium, it's not like it's a chore to maintain the stockpile. How much does it cost to hermetically seal a

The thing that bothers me is that, once you have the helium, it's not like it's a chore to maintain the stockpile. How much does it cost to hermetically seal a noble gas inside a durable container, and stow it in a warehouse?