As long as we're talking alternatives, and assuming you're looking to damp the ringing of metal stands and are not necessarily interested in making the stands heavier, try kitty litter. Real cheap experiment. Go to your local supermarket and pay $1.99 for a bag of Jonny Cat unscented kitty litter. Should be enough for one set of stands. Try it. If it doesn't do the job, you're out $2 plus sales tax.
If you are interested in adding weight to the stands, lead shot or sand would be better.
If you are interested in adding weight to the stands, lead shot or sand would be better.