Where can one purchase lead shot for speakers?

Don't use steel shot as it will resonate. I use a 50/50 mixture of dried sand and lead shot ( #6 is good). Use as course of sand as you can find. Sand used for concrete is good. Masonry sand is too fine.
A few days before you want to fill your stands start drying your sand. The simplest and least messy way to dry sand is to spread it on a piece of plywood or other flat surface. Do it in your garage if you have one. Spread out the sand and rake through with your fingers, creating a lot of furrows and ridges (more surface area). Do this raking as often as you can to hasten the drying. I use a fan also. You want the sand bone-dry. (Beware of silicosis).
Other things you'll need:
plastic funnel
a 1-cup measuring cup
coffee can or similar container to mix the sand and shot
latex gloves- rubber gloves are too bulky
a simple cloth dust mask
My Dynaudio stands came with long plastic bags to be used as liners for the columns. I think any manufacturer of stands should include these, but many don't.
Scrape the sand into a pile. Mix 1 cup sand and 1 cup shot in the coffee can or container. Don't mix batches larger than 4 cups as the shot will separate from the sand. Start pouring the mix via the funnel into your stands. I fill completely to the top. Cap off and wipe down. Discard everything correctly.

For you people that don't think lead can't be handled safely: Do not go to service stations or battery stores as there are battery carcasses containing lead plates laying around everywhere; In fact, do not own a car as you are perpetuating the use of lead-acid starting batteries; Do not go to boatyards as 95% of all those sailboats there use, God forbid, lead keels. My boat has a 7000 lb. hunk of lead hanging under it (Damn I'm feeling guilty); Do not live in a house built prior to the mid '70's' as it probably contains lead-based paint and lead solder in the plumbing.
Carry your stands and your guilty conscience into the house, set those speakers on top and start rockin' (but your stands won't).
The 50/50 mix is based on my experimentation over the years. All lead was too dead. All sand wasn't enough mass. Steel rings. Empty stands blur the mids and bass (probably Doppler effect from the speakers moving fore and aft).
And for a nice little touch, throw some Herbie's Fat Dots between your speakers and stands. Now crank up the music and let that guilty conscience melt away.

I agree with much of Hoff48 says. I enjoy low volume listening and my trials indicate that all dry sand is too colored. All steel (blasting shot) was quite interesting and lively, but also very colored. Lead shot sucks the life and vibrancy from the speaker, though a 50:50 mix with sand might not be too bad. My optimum was a 50:50 mix of sand and steel shot. Not colored, but still vibrant and lively.

Elevick, good point.
Joe

I also have the VS VR4 Jr's. A nice improvement is to use Herbie's big fat dots between the bass module and mid/tweeter module. Something about better damping of the vibrations from the bass cabinet made the mid/tweeter cabinet image better. Worthwhile tweak for approx $80. Enjoy the music.
http://herbiesaudiolab.home.att.net/bigfat.htm

Thanks for all of the input. I have read all of these threads as well as the previous posted threads on this subject and had no idea when I posed it that this question would elicit such a lively debate. I'm going to have to do some more research on this matter before I decide what to do. people have mentioned such products as the Lovan Black Gold and Atabites. Has anybody actually used either of these products? What was your experience with them?

Thanks,

Bill