"These cables are used to detonate the charges in atomic bombs. It's perfectly legal to own these. They're relics from the atomic bomb development at Los Alamos National Laboratory." Only $US5 at the Black Hole shop, in Los Alamos, New Mexico.
That's the kind of material you can get at the Black Hole, a military surplus store that has all kinds of material from the Manhattan Project era, from those cables to old-school scientific calculators.
I'd have loved to meet the founder, Ed Grothus: