This is my regular post as requested by Tom at SKF bearing.

ball bearings refers the complete bearing units, consisting of inner and outer races, balls, and retainers and seals if any. the balls themselves aren't bearings, they're just balls. Or if you prefer bearing balls to distinguish them from golf, tennis or cannon balls.

If you search the internet for ball bearings, you'll find complete bearings, and those who sell them. For the balls search "bearing balls" and you find companies that sell those.

Sorry for the terminology lesson, but I made a promise, and anyway on this thread it might help save time and direct readers to what they need.