You are talking if helium is stored in atmospheric pressure. It is generally sold compressed like all other gas. Search google for 10kg helium tank. In my area it is available for $30.
That’s the weight of the tank not the helium inside it. They should advertise it as filling ~30 helium balloons. Which obviously weigh far less than 10kg or they wouldn’t float.
The ~300 cubic foot tanks are 9 inches in diameter, 55 inches tall, with about 130 pounds and contain about 1.5kg of helium.
