Where can one purchase lead shot for speakers?

Lead as a straight metal is relatively harmless. It's the Lead Compounds that are toxic. And even then they become toxic only when taken into the body. Keep any lead shot dry, handle with gloves, and don't breathe the dust (if any). If you touch Lead - simply wash your hands afterwards. That's what I do after soldering.

For a little perspective, and a statistic for those so inclined, my personal experience.

After 40 years of daily professional exposure to lead, in totally haphazard and uncontrolled conditions, I thought it wise to ask my doctor to test my blood Pb levels at my last physical.

The test came back as 6 ug/dcl, barely above background levels.

As to disposal, lead has been re-cycled for thousands of years. Look in the yellow pages for metal re-cyclers (formerly know as junk yards). Not only will they take lead but they will pay you for in.

Some will say no lead level is safe, but they usually have an ax to grind, like a profitable law suit, a book to sell, or a career in law enforcement. (yes I am talking to you)

So be careful, use a mask and gloves, don't dump it in the yard or feed it to your kids.

On the other hand, there are other things you could use, so maybe that is the way to go.

They could not provide any statistics of death or illness related cases reported to them. They had no other statistics other than children under 6. And those stats reflect that out of 23 million children 8000 had levels higher than 10, and less then 64 had levels above 50, which is the level that can cause illness and seizures. NO reported deaths

I have the stats if you want them
I have the same conclusion as Joey lawn, someone has an ax to grind or an agenda when its related to Lead

CDC - 202-564-7873

The header was cut off, I did the research yesterday. I contacted the EPA and CDC.

Just don't eat it for breakfast every day. Sheesh, let's get real. Anything might kill you if you ingest enough of it. Loading up your speakers or stands with it will not. Putting insulation in your attic isn't supposed to be good for you either but I've never heard of anyone dying from it. By the way, when I sold my VR4jrs, I told the guy I put lead shot in them and that I was going to remove it before I shipped them. I wasn't worried in the least that the guy would "freak out" over it.