Tritium cannot be imported in large quantities to the US due to Regs, so Amazon can't sell them but companies outside the US can sell individual trits/groups of trits. Vinh is a CPF Member who modifies lights so it is just like you or I selling a light to each other that has a trit installed-perfectly ok. And the great thing about CPF is that if I happen to not be 100% correct, someone else will post a correction-one big happy family! I think Banggood used to sell the Lumintop Torpedo with your choice color trit installed but don't know if they still do...