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.
I've seen the scuba stuff with tritium.
I go the low tech route for when I do night dives. I go to the dollar store and buy a bunch of those glow in the dark cylume plastic halloween things.
Just before entering the water, I give everyone a different color, break the vial inside and activate them, and that way, I know who is who underwater and if a flashlight breaks down, we know where that person is.
Leave my night sights alone.