Texas Coin has a large selection of 99.9 % pure silver bars.  1,5,10, kilo and 100 ounce bars are available. 

 

I do want to note silver here also.   Silver is more volatile as it is both a precious metal but an industrial metal.  It is the best conductor of electricity, best conductor of heat and cold, and the best reflector.  It is used in almost everything electronic.  Also used as an antibacterial agent and in solar panels.    It is also a store of wealth (value).   In 1958 you could buy a new Corvette with 3,500 silver dollars, today 3,500 Morgan silver dollars will buy you a new Corvette.