It’s a by-product of natural gas. In 1996 (Clinton), Congress passed a law to phase out helium production by 2021, and the main producer in Amarillo Texas is doing just that.
I just went to get balloons for our park concert and was not able to purchase them. “We won’t know if we have any helium. Call a few days before the concert.”
The He from gas is so cheap it makes it uneconomical to obtain it by other means.