A product called "Soundbytes" is supposed to be good. I use unscented kitty litter, which you can find at your local supermarket, cheap. Works fine. Oh, and it was recommended to me by a friendly high end retailer, not one of those "wire is wire" "naysayers" everyone around here likes to dismiss.
Before you run out and buy a bag full of lead, consider the fact that it can be very hazardous, especially to children. Also, many jurisdictions would consider it to be a "hazardous waste" if and when you want to dispose of it. From my experience sand works just as well and is essentially harmless. Just a thought...
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