Automotive valve springs. Preferably, not performance ones. Glue them to a MDF, acrylic or marble top, to keep it from toppling over.
Haven't tried this yet but my CDP will skip on bass notes if I turn up the volume. I just haven't turned it up that much in a while.
Most industrial isolation is springs and they're spec'd for the weight. Ideally, they'll compress 50% to 75% their range for the given weight.