Hi Jill,
 
You may find DMSO at some health food stores, or at a vet supply. Generally the 
DMSO is genrally rated as 99% pure and 90% by volume. There is one health food 
store that carries it, I believe that it is Wild Oats.
 
 Most of us use 10% DMSO and 90% Silver solution of any PPM. you can go to 15% 
DMSO but Its not needed.
 
"Ole Bob"