The best product I have found is on the audiopoints.com website. It's called Micro-Bearing Conductive Steel Fill Material. Works great, I have been very impressed with the sonic charateristics.
It comes in 25lb bags at your local shooting supply store. Costs between $12-18 depending on the hardness, brand, and state of the lead supply. If you are really ginky about the lead issue (I believe it is a red herring) you can buy bismuth shot (ingredient in Pepto-Bismol) that is non-toxic but will cost you 3x that much.
We all know that lead is very dangerous and no matter how good we will hide it there always be a harmful dust.
Police department is using steel bullets and steel shots for their shotguns when they shoot in the training range.
And my question is will I improve my speakers if I drop into the load hole steel balls instead of lead shots? Steel tends to vibrate and create a resonance like a cooper. I believe that I can load my stand with steel balls but the price of 100lB is arround $700.
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