Where to find Zen Magnets and other 5mm spheres.
It's like we're here discussing mastery and technique with an intelligent community about a high skill hobby-craft, then nanny takes our precision scissors, and says we're only allowed children's safety scissors.
"Why doesn't the US CPSC want me, as a responsible adult, to prevent obtaining proper 5mm magnets for myself?" Good luck getting an answer from anybody on that one. Does that make you sad? Perhaps you should go skiing, or go jump on a trampoline, or go ride a motorcycle to the liquor gun store instead.