How about the Vibrapods recommended by Stereophile? Got mine at Acoustic Sounds website. Hope this helps you.
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I've tried a number of devices and I like the Symposium Roller Blocks, especially with the titanium balls. I have them under my turntable, CD transport, pre-amp and DAC. In fact, I have the "double blocks" (one block under and one upside down on top of the ball) under the TT & CD. They are a terrific tweak, not inexpensive, but, still, less costly than some other sophisticated isolation devices.
I use stillpoints with risers under my CDP and really did not want to hear an improvement but I did. I also tried Herbies iso-cups with ebony balls and they were almost, (probably just as), good as the still points. A bit more detail without being bright, a bit more depth to the sound stage. I now use the Stillpoints under the CDP, and herbies iso-cups with ebony balls under tubed phono stage and preamp and Herbies big feet under power amp. Billy Bags rack.
The FIM 305 is a double ( upper and lower ) cup plus ball device which is not very high. Steel, tungsten and ceramic balls are available. Although the instructions tell you how to make a platform and set them into it, they work very well on their own. They are more expensive than BDR cones but even more effective in my system, and cheaper than Symposium Rollerblocks.
have you considered sound boosters by sound fusion ?
i use them under all of my components--amp, preamp and cd player.
go to soundfusion.ca to see what they look like.
i am biased toward these devices and have reviewed them as well. the good thing about them is their cost, somewhere between $0.00 to $60.00 per set of 4.