I have compiled a list of sources for the elements that are available to the amateur chemist. Argon will be discussed here.
Argon is a colorless, odorless, unreactive gas that makes up 1% of the atmosphere. It is the most abundant noble gas. It forms a few compounds that are highly reactive.
In element form: Argon is found in tanks for welding. Incandescent light bulbs, unless otherwise specified, have 88% argon in them.
In compound form: Argon does not form any commonly used compounds.
Here is my sample of argon. It is a Christmas light bulb. As argon is so cheap compared to krypton, it is used in the vast majority of bulbs.