speaker stands on wood floors

I'm looking for advice on coupling (or would it be isolating) my speaker stands to the floor. I have a hard wood floor and want to avoid spiking the wood directly (but as a last resort, I'll do it anyway). I was thinking I'd use the spikes, but place those round metal disks below them. I read about some disks that were lead in the middle, encased in an outer brass ring, but those were too expensive. I want to do this for about $60. I would need 12 devices since this situation also applies to my component rack. That's about $5 per device. I already have the spikes for the speaker stands and the rack. I'm new to this level of tweakiness, so I'm not familiar with the brand names of the discs or their cost. And any other suggested techniques for the speaker stand coupling would be welcomed.

Thanks
Don