http://akromatic.com is my favorite resource for shiny balls. Expensive, but worth it.
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Unfortunately it seems as if this business has closed down 
I have had this in my bookmarks for a while now
https://www.amazon.com/dp/B07PPFTY2L?ref=myi_title_dp&th=1&psc=1
Does anyone know of any other places who sell chrome and grey balls?