Based off of your comment history, it seeeeems like you live in the US, although I could deffo be wrong. That’s where I live, so I may have good news. It’s illegal to sell tritium products in the US, but it’s not illegal to buy it as an individual. There’s a Taiwanese company that sells all kinds of cool little tritium widgets: https://www.mixglo.com/
that’s where I got my vial from. It wasn’t cheap for what it is, but I think it’s cool.
edit: looks like they also ship to Canada if you live there. I’ve no idea what the laws are up there, but I’m assuming it’s legal if they’re willing to ship.
God, I hated this book when I read it in high school. I avoided Victorian-era literature for so long because of it.
I doubt I had the emotional maturity to get much out of it back then. I’d probably have a better time now, but I have a grudge at this point and I’m gonna stick with it, dammit.