While some manufactured goods containing tritium are not sold outside of military/law enforcement, it's because the manufacturers, or their agents, have made the decision not to sell them to the general public.

Seeing as how one can purchase a watch or compass with tritium components over the web, it's not something that can be considered "strictly controlled."

The only bad thing about having tritium components in your kit is regardless of how much you pay, they still have a half life of only a dozen or so years. (Or, if you break the glass/plastic container & allow yourself direct contact to the tritium itself.)