This is an old source  but it doesn’t hurt to give them a try.
They guarantee the balls to be perfect and they certainly were that.
They were also quite expensive but “time is money” whether it is
your’s or your supplier’s. The balls came in 3 sizes .016", .024" and
.032" and in fine silver or 22K. At that time the fabrication charge
for 1/4 oz was $125.00, 1/2 oz-$175 and 1 oz-$300. Of course 1/4 oz of
.024" balls would give you 6250 of them in silver or 3650 of them in
gold. If purchasing silver the fabrication price included the cost of
the metal. If purchasing gold, the daily price of gold would be added.
SPM, 431 Fayette Ave., PO Box 771, Mamaroneck, New York, 10543,
Since the source is old I would bet chances are good that the area
code has changed.
There is much in the Archives. Use granulation as your
Orchid Rules!..Karla in So Cal.