I have compiled a list of sources for the elements that are available to the amateur chemist. Rhenium will be discussed here.
Rhenium was the last non-radioactive element discovered. The metal itself is extremely dense and lustrous. Rhenium has the highest boiling point of any metal. Rhenium forms perrhenate compounds, which are the most commonly traded form of rhenium. These are much weaker oxidizing agents than the permanganates. Rhenium metal is made by heating the ammonium perrhenate. The rhenium powder is then sintered to form the desirable shape. Rhenium is one of the rarest elements in the earth's crust, with an average concentration of 1 milligram per metric ton in the earth's crust. Rhenium forms a wide variety of colorful and not well-defined compounds in many oxidation states.
In element form: Some thermocouples have tungsten/rhenium alloy in them. Antique GE rhenium flashbulbs have a tungsten/rhenium alloy filament used to trigger the flash.
In compound form: No sources found.
I do not have any rhenium collected at the time of this writing.