Helium isn't usually sold by the gram, but by volume. Typical prices for a, say, 15 cubic foot container (that's 15 cubic feet at STP; the container itself is significantly smaller) would be around $50.
A cubic foot is about 28.3 L, so that's about $0.12 per liter. A mole of ideal gas at STP is 22.4 L, and a mole of helium would have a mass of 1 gram, so, roughly $2.70 per gram is about right.
As with most things, you can get a much better price if you buy in bulk.
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It costs about $27 million per gram.
As of early 2021, the cost of one gram of iridium is approximately $90-$100 USD. Iridium is one of the rarest elements on Earth and is used in various industrial applications, which contributes to its high value.
I won't even waste the time looking up actual numbers.a mole of atoms of helium is about 4 grams, therefor 1 gram of helium is about 0.25 moles of helium atomsa mole of atoms of uranium is about 238 grams, therefor 1 gram of uranium is about 0.0042 moles of uranium atomsA gram of helium contains more atoms than a gram of uranium by about a factor of 60.
This will be a expensive bill to pay. It will set you back 62.5 trillion dollar. But there is problem, to make a gram of anti-protons will take a few million years whit current technology. But in the near future we can do it a lot quicker.
There are approximately 0.035273 ounces in one gram.