Some things on the topic of Helium:
Where located: Helium is found underground as well as trace amounts in the ocean. If I recall correctly about 20% off all natural gas deposits, by volume, are made up of Helium, so it is not going away soon. The amount of Helium per well is quite variable.
Origin: Remember whenever you note radiation reactions that emit alpha particles you are noting Helium production. Far and away the most Helium is created in (the main pathway) reactions that change uranium to lead. The uranium remaining in the earth is tiny compared to historical amounts so very little helium is thus being produced today, and so helium is considered a non-renewable resource.
How used: In activities needing an inert (relatively) substance. It is especially important in cold temperature physics, as low temperatures can be reached without the cost and difficulty of dealing with hydrogen. The coldest temperatures do require hydrogen. Helium is also extremely important in quantum research as many strange quantum qualities are seen in Helium (due to QM effects relative to its full electron orbital). Being extremely simple in subatomic components it offers the only substance other than hydrogen in which actual QM calculations are, to some extent, possible.
Helium deficit: I am not current on this but I would bet any problems getting Helium are due to short-term production issues rather than the end of the resource.
New Helium sources: While helium has been found on the moon, “relatively loaded” seems quite optimistic relative to actual amount, and minimal research results. However, I have heard of a new source of helium found in Martian rock samples that contain blood vessels and vertebra of animals… perhaps you should look into this new source.