I have some deuterium and tritium in my swimming pool.
At least a few molecules.
Deuterium you can purchase thru the mails as well. :-)
Tritium is found in many items such as illuminated watch hands.
In fact, you can purchase sealed borosilicate vials that contains Tritium inside a phosphor coating that will glow for 30 years. People use them for scuba diving and on key rings.