Yes it is possible..also you know those tumblers they sell at toy stores for stones? Some insulators do fit in those and some insulator collectors use those to tumble. I never tried it.
I have heard of some crazy amounts upto 100 each and they tumble for 3 days and no matter what they look like they are done according to them.
Yeah right. only a fool does things that way.
I have been tumbling for 4 years now. I only charge 15 per bottle unless it needs to be cut. then it's 20 each.
To get a bottle done here will set you back between AU$60 to $100, I must pull my finger out and finish my set up [] after I've done a few hundred of my own I'll start advertising at shows [] .
Partly a monopoly by the few doing it until recently, mostly due to people being willing to pay that much. It's changeing now as more and more collectors get into tumbling (a few got gear off the jar doc. and a lot of others copied [] ).