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I used to do this with a vibrating sander glued to the bottom of the bucket to give an effect like the ultrasonic. Also used to use it with dry rice as a media, which worked well aside from blocking...

Diy tumbler cost, $16

then into the ultrasonic, which was free (older unit from a jeweler friend)
and into the dehydrator, which was also free
If i had to choose one, for the same price, it...