You might be able to still get them in the MidWest, they are banned down here after some fools swallowed a few on a dare.
The acetone is making it harder to make them as it is used to make illegal drugs, and you can either buy small quantities or tanker full, but rarely anything in between as would be used by the small American fireworks manufacturers. I visited a small manufacturer in New York before the family quit because of regulations and residential encroachment. They manufactured big displays, not the consumer stuff.
There’s no way to be sure what the Chinese or Mexicans are using, other than chemical analysis.
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