It's amazing how much material we have brought back or found from the moon over the years, considering there weren't all that many moon missions and each one would have been very careful about spare space and weight. I guess they make plans to include soil samples before they leave though.
I wonder how much of it is actually in private hands. I remember seeing a lot of ads for "moon rocks" over the years. Are any of them genuine, or does NASA pretty much keep the stuff for their own analysis?
I know lunar meteorites might be more likely to be bought and sold, and in fact I've even heard that that is a bad thing, because of the loss to science. Some countries have rules that meteorites belong to the government, but there is always someone willing to break the law to make a profit.