Mye Speaker Stand type of fill material

I am using and am happy with the Star Sound Micro Bearings from Star Sound. Via phone he was able to calculate the amount I needed. It was less than I was going to order. He also uses flat rate shipping when possible so my shipping costs was $13.00. I believe it would be worth a call to Star Sound to discuss your situation.
Good Listening.
David Pritchard

That is good news. I am a Star Sound dealer and have had some on order for quite a while.

I used steel blasting shot and sand. Very inexpensive.

There is another damping material called "Black Gold" made by Lovan. It's not too expensive, maybe you want to give that a try??