Most 'traditional' moth balls have, in recent years, been made using naphthalene. These have now been banned:
http://www.thaindian....issues_100119780.html
Dichlorobenzene has also been used but its now outlawed, as it's believed to be carcinogenic.
Camphor used to be used but was discontinued in favour of the cheaper (and more effective) compounds referred to above.
So I'm surprised to find ANY traditional moth balls still being sold. However Amazon still stock (what appear to be) them:
http://www.amazon.co....h-balls/dp/B001TYPKYW
For alternatives to moth balls, see here:
http://www.aboutmypla...ther-options-instead/
Chris