The link in the original thread died almost sixteen years ago. I wouldn't expect any to be available there.

They're trivial to source. I got mine from a guy out of the UK on eBay.

Glow Rhino looks to be a domestic source for tritium doodads. As I said, it's easy to get trit these days.

They're surprisingly bright. I have tritium markers on keychains, flashlights, knives, etc.

Highly recommended bling.