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Most online bike shops don't seem to sell them at all
But online bearing suppliers do. If you're setting up to be ready for legacy bike stuff, get 100 each of 1/4", 3/16", 5/32"and 1/8" from somebody like https://simplybearings.co.uk/shop/index.php?cPath=23_7240&&selection=AISI+52100+Chrome+Steel+Loose+Ball+Bearings
I'd guess 1/4", 9 balls a side