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I've found bb's at the thriftstores, also, I read somewhere that if you call the bowling alley's they may have some they need to dispose of and you can get them free.
The rock tumbler on the other hand, you may find one on sale at Harbor Frieght, also, sign up for their e-mails, they send out coupons and also give you 15 % off your total sale on some days..
and you can also ask for one on Freecycle in your area or Craigslist in your area...