An excpert from something from TFSE....
~No, you cannot get it out of picture tubes on TVs
Yes, you can get it off match strikers
Yes, you can get it from road flare strikers
Yes you can walk into a Chem. supply house and buy 4 oz for $50
Yes you can mail order it to your business for very much cheaper. $95 for 2 kilos
Yes it is found in fireworks