it looks like the dayton isolation cones are now $25.19...
Radioheadokplayer (Threads | Answers)
Despite their name, Dayton brass isolation cones are not isolation devices. They are coupling devices.
Metal cones drain vibration to the surface below by coupling to it. Dayton cones, Mapleshade footer, and AudioPoints are examples.
There are many isolation devices: industrial air tables, audio platforms by Neuance, HRS, etc., Herbie's footers, Isonoe footers, Vibrapods, and sorbothane.
Some products try to accomplish both. Symposium Rollerblocks, Aurios, and Boston TuneBlocks are examples of these.
Which of these an individual will prefer is entirely up to the individual, IMO.