Judas

https://en.wikipedia.org/wiki/Silver#History

In folklore, a bullet cast from silver is often the only weapon that is effective against a 

1. werewolf, 
2. witch, or other 
3. monsters.

Kitco

http://www.kitcosilver.com/

Coin

http://www.silvercoins.com/

Institute

https://www.silverinstitute.org/

Investor

http://www.silver-coin-investor.com/