Canadian Maple Leafs, available from any coin dealer.  Very pure, and
quite inexpensive.

Marshall

John wrote:

> List, It would appear that 99.99% fine silver is almost impossible to
> obtain, even in USA, below is a copy of two emails from Hauser &
> Miller, who are I believe leading precious metal dealers in USA. Any
> comments anyone? John in Australia  Dear John, All we carry is .999
> fine silver, not .9999. It is available in 12ga, we can ship to
> Australia, and we do accept Visa. Thanks. Amber Sebold
> Sales Representative
> Hauser & Miller Co.
> 1(800) 462-7447 John, Sorry, not off-hand do I know any merchants of
> 4-9's silver. As for the impurities, usually it is copper but of
> course it varies and to find out exactly we would have to do a
> chemical analysis. The silver runs about $3.50 a foot approximately.
> Our fax number is +1-314-487-0394. That should work. If you have any
> more problems faxing you can always e-mail in an order. Thanks! Amber
> Sebold
> Sales Representative
> Hauser & Miller Co.
> 1(800) 462-7447