Does NASA buy a lot of helium?

Could you please elaborate on the question, "Does NASA purchase a significant amount of helium?" I'm curious to know if their operations rely heavily on this element and, if so, for what specific purposes? I'm also interested in understanding whether NASA has a regular demand for helium or if their purchases are more intermittent, depending on particular projects or missions. Additionally, I'm wondering if there are any specific challenges or considerations that NASA faces when acquiring helium, given its unique properties and potential scarcity. Thank you for clarifying this matter.