Tvad - I'm not sure if this is going to take you where you need to go, but:
http://www.mcmaster.com/
If it is not a direct link, then type in "carbide balls" (sans parentheses) in the search box. When the navigation tree pops up on the left select Tungsten Carbide Balls, then Precision Grade 25..., then you size.
http://www.mcmaster.com/
If it is not a direct link, then type in "carbide balls" (sans parentheses) in the search box. When the navigation tree pops up on the left select Tungsten Carbide Balls, then Precision Grade 25..., then you size.